We need to add support for binary (de)/serialization to compas_eve messages using compas_pb using the following specs:

• A Transport should accept a new optional parameter codec. By default, if None is specified, compas_eve should use its own JsonMessageCodec.
• Codecs are classes that know how to encode and decode a message down to a different representation. The default one being JSON, which is provided by JsonMessageCodec. Also add an abstract class MessageCodec
• Currently, the implementations of transport has a call to topic._message_to_json(..) and topic._message_from_json(..) to encode and decode. This should change to be topic._message_to_data(..) and then self.codec.encode(..) (and the respective decoding part).
• A new codec should be added, called ProtobufMessageCodec to support binary serialization.
• The requirement to compas_pb should be optional, so, if compas_pb is not installed, the codec is simply going to report it cannot be used because compas_pb needs to be installed.
• Please take into account that there are 3 cases of messages: a Message instance, any object with __data__ (ie. a COMPAS data object), and anything that can be casted to a dict. This roughly means this method should handle most things. However, compas_pb already handles COMPAS data objects and fallback to dictionary, so the last two options are probably the same.

    def _message_to_data(self, message):
        """Convert a message to a data representation ready to be encoded.

        Normally, this method expects sub-classes of Message as input.
        However, it can deal with regular dictionaries as well as classes
        implementing the COMPAS data framework.
        """
        try:
            data = message.data
        except (KeyError, AttributeError):
            try:
                data = message.__data__
            except (KeyError, AttributeError):
                data = dict(message)
        return data

• In the process, please remove the mqtt_cli implementation, and all support for IronPython, because we will bump the major and forget about Rhino 7.