Add implementation for serialize() callback
Add keys for event serialization
Add interface + stubs + states for serializer state helper(s)
Add implementation for serializer_context_new()
Add helper for generating a new key in the buffer
Add implementation for serialize_event()
Add test file for serializer test
Add test for serializing a ws_message (which is not valid)
Add test for serializing an event
Add test for too small buffer
Add test for event with ctx: obj-id serialization
Close main map in serialize()
Add support for value reply serialization
Add test to test a value reply serialization
Add test for value reply with int reply value
Add support for serializing error replies
Add test for serializing error reply