feat: add support for enum fields #161
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This is just the most basic change to get enums working at all for regular fields (not primary key fields). Ideally serialization would be pushed into the engine rather than being implemented by drivers. Also, ideally there would be some configuration to control the mapping to table columns and database types; you might want to store the fields of an enum in a separate column, for example, or have a "None" value of the enum map to a null value in the database to facilitate sparse indexes in a database like DynamoDB.