Support TextFormat skipping reserved field names and numbers.

The spec calls for this, so just building out the matching support.

- Update `_NameMap` to track reserved numbers and names and check if a value is
  reserved.
- Update `TextFormatScanner` to skip reserved numbers/names.
- Update the generator to capture reserved field names/numbers.
  - Sort/merge the reserved field ranges. This won't really make an performance difference, but by merging them the generate data could end up being smaller.
  - Factor the code out of the extension range code so it can be used also for the reserved fields.
- Regenerate to pick up the new data.
- Also clear `text_format_failure_list_swift.txt` as the tests now pass with the additional data.
- Update the generated_swift_names_* files.
- Add a test to ensure reserved fields don't break parsing.

Author: thomasvl

Protos/SwiftProtobufTests/generated_swift_names_enum_cases.proto

@@ -12,7 +12,7 @@ message GeneratedSwiftReservedEnums {
   enum alwaysPrintEnumsAsInts { NONE_alwaysPrintEnumsAsInts = 0; }
   enum alwaysPrintInt64sAsNumbers { NONE_alwaysPrintInt64sAsNumbers = 0; }
   enum annotation { NONE_annotation = 0; }
-  enum any { NONE_any = 0; }
+  enum Any { NONE_Any = 0; }
   enum AnyExtensionField { NONE_AnyExtensionField = 0; }
   enum AnyMessageExtension { NONE_AnyMessageExtension = 0; }
   enum AnyMessageStorage { NONE_AnyMessageStorage = 0; }
@@ -193,7 +193,7 @@ message GeneratedSwiftReservedEnums {
   enum customCodable { NONE_customCodable = 0; }
   enum CustomDebugStringConvertible { NONE_CustomDebugStringConvertible = 0; }
   enum CustomStringConvertible { NONE_CustomStringConvertible = 0; }
-  enum d { NONE_d = 0; }
+  enum D { NONE_D = 0; }
   enum Data { NONE_Data = 0; }
   enum dataResult { NONE_dataResult = 0; }
   enum date { NONE_date = 0; }
@@ -209,7 +209,7 @@ message GeneratedSwiftReservedEnums {
   enum decodeJSON { NONE_decodeJSON = 0; }
   enum decodeMapField { NONE_decodeMapField = 0; }
   enum decodeMessage { NONE_decodeMessage = 0; }
-  enum decoder { NONE_decoder = 0; }
+  enum Decoder { NONE_Decoder = 0; }
   enum decodeRepeated { NONE_decodeRepeated = 0; }
   enum decodeRepeatedBoolField { NONE_decodeRepeatedBoolField = 0; }
   enum decodeRepeatedBytesField { NONE_decodeRepeatedBytesField = 0; }
@@ -271,7 +271,7 @@ message GeneratedSwiftReservedEnums {
   enum discardUnknownFields { NONE_discardUnknownFields = 0; }
   enum Double { NONE_Double = 0; }
   enum doubleValue { NONE_doubleValue = 0; }
-  enum duration { NONE_duration = 0; }
+  enum Duration { NONE_Duration = 0; }
   enum E { NONE_E = 0; }
   enum edition { NONE_edition = 0; }
   enum EditionDefault { NONE_EditionDefault = 0; }
@@ -384,7 +384,6 @@ message GeneratedSwiftReservedEnums {
   enum GeneratedCodeInfo { NONE_GeneratedCodeInfo = 0; }
   enum get { NONE_get = 0; }
   enum getExtensionValue { NONE_getExtensionValue = 0; }
-  enum googleapis { NONE_googleapis = 0; }
   enum Google_Protobuf_Any { NONE_Google_Protobuf_Any = 0; }
   enum Google_Protobuf_Api { NONE_Google_Protobuf_Api = 0; }
   enum Google_Protobuf_BoolValue { NONE_Google_Protobuf_BoolValue = 0; }
@@ -438,6 +437,7 @@ message GeneratedSwiftReservedEnums {
   enum Google_Protobuf_UInt64Value { NONE_Google_Protobuf_UInt64Value = 0; }
   enum Google_Protobuf_UninterpretedOption { NONE_Google_Protobuf_UninterpretedOption = 0; }
   enum Google_Protobuf_Value { NONE_Google_Protobuf_Value = 0; }
+  enum googleapis { NONE_googleapis = 0; }
   enum goPackage { NONE_goPackage = 0; }
   enum gotData { NONE_gotData = 0; }
   enum group { NONE_group = 0; }
@@ -577,6 +577,7 @@ message GeneratedSwiftReservedEnums {
   enum isInitialized { NONE_isInitialized = 0; }
   enum isNegative { NONE_isNegative = 0; }
   enum isPathValid { NONE_isPathValid = 0; }
+  enum isReserved { NONE_isReserved = 0; }
   enum isValid { NONE_isValid = 0; }
   enum itemTagsEncodedSize { NONE_itemTagsEncodedSize = 0; }
   enum iterator { NONE_iterator = 0; }
@@ -695,12 +696,12 @@ message GeneratedSwiftReservedEnums {
   enum numberValue { NONE_numberValue = 0; }
   enum objcClassPrefix { NONE_objcClassPrefix = 0; }
   enum of { NONE_of = 0; }
+  enum OneOf_Kind { NONE_OneOf_Kind = 0; }
   enum oneofDecl { NONE_oneofDecl = 0; }
   enum OneofDescriptorProto { NONE_OneofDescriptorProto = 0; }
   enum oneofIndex { NONE_oneofIndex = 0; }
   enum OneofOptions { NONE_OneofOptions = 0; }
   enum oneofs { NONE_oneofs = 0; }
-  enum OneOf_Kind { NONE_OneOf_Kind = 0; }
   enum optimizeFor { NONE_optimizeFor = 0; }
   enum OptimizeMode { NONE_OptimizeMode = 0; }
   enum Option { NONE_Option = 0; }
@@ -746,8 +747,14 @@ message GeneratedSwiftReservedEnums {
   enum proto2 { NONE_proto2 = 0; }
   enum proto3DefaultValue { NONE_proto3DefaultValue = 0; }
   enum proto3Optional { NONE_proto3Optional = 0; }
-  enum ProtobufAPIVersionCheck { NONE_ProtobufAPIVersionCheck = 0; }
+  enum protobuf_extensionFieldValues { NONE_protobuf_extensionFieldValues = 0; }
+  enum protobuf_fieldNumber { NONE_protobuf_fieldNumber = 0; }
+  enum protobuf_generated_isEqualTo { NONE_protobuf_generated_isEqualTo = 0; }
+  enum protobuf_nameMap { NONE_protobuf_nameMap = 0; }
+  enum protobuf_newField { NONE_protobuf_newField = 0; }
+  enum protobuf_package { NONE_protobuf_package = 0; }
   enum ProtobufAPIVersion_2 { NONE_ProtobufAPIVersion_2 = 0; }
+  enum ProtobufAPIVersionCheck { NONE_ProtobufAPIVersionCheck = 0; }
   enum ProtobufBool { NONE_ProtobufBool = 0; }
   enum ProtobufBytes { NONE_ProtobufBytes = 0; }
   enum ProtobufDouble { NONE_ProtobufDouble = 0; }
@@ -767,12 +774,6 @@ message GeneratedSwiftReservedEnums {
   enum ProtobufString { NONE_ProtobufString = 0; }
   enum ProtobufUInt32 { NONE_ProtobufUInt32 = 0; }
   enum ProtobufUInt64 { NONE_ProtobufUInt64 = 0; }
-  enum protobuf_extensionFieldValues { NONE_protobuf_extensionFieldValues = 0; }
-  enum protobuf_fieldNumber { NONE_protobuf_fieldNumber = 0; }
-  enum protobuf_generated_isEqualTo { NONE_protobuf_generated_isEqualTo = 0; }
-  enum protobuf_nameMap { NONE_protobuf_nameMap = 0; }
-  enum protobuf_newField { NONE_protobuf_newField = 0; }
-  enum protobuf_package { NONE_protobuf_package = 0; }
   enum protocol { NONE_protocol = 0; }
   enum protoFieldName { NONE_protoFieldName = 0; }
   enum protoMessageName { NONE_protoMessageName = 0; }
@@ -953,22 +954,22 @@ message GeneratedSwiftReservedEnums {
   enum utf8ToDouble { NONE_utf8ToDouble = 0; }
   enum utf8Validation { NONE_utf8Validation = 0; }
   enum UTF8View { NONE_UTF8View = 0; }
-  enum v { NONE_v = 0; }
+  enum V { NONE_V = 0; }
   enum value { NONE_value = 0; }
   enum valueField { NONE_valueField = 0; }
   enum values { NONE_values = 0; }
   enum ValueType { NONE_ValueType = 0; }
   enum var { NONE_var = 0; }
   enum verification { NONE_verification = 0; }
   enum VerificationState { NONE_VerificationState = 0; }
-  enum Version { NONE_Version = 0; }
+  enum version { NONE_version = 0; }
   enum versionString { NONE_versionString = 0; }
   enum visibility { NONE_visibility = 0; }
   enum VisibilityFeature { NONE_VisibilityFeature = 0; }
   enum visitExtensionFields { NONE_visitExtensionFields = 0; }
   enum visitExtensionFieldsAsMessageSet { NONE_visitExtensionFieldsAsMessageSet = 0; }
   enum visitMapField { NONE_visitMapField = 0; }
-  enum visitor { NONE_visitor = 0; }
+  enum Visitor { NONE_Visitor = 0; }
   enum visitPacked { NONE_visitPacked = 0; }
   enum visitPackedBoolField { NONE_visitPackedBoolField = 0; }
   enum visitPackedDoubleField { NONE_visitPackedDoubleField = 0; }