refactor: split string converters

Merge pull request #12 from Rutherther/packets

Implement custom packet serializer

feat: enable inline converters in all packets

feat: add support for conditional packet attribute

feat: add bool type converter

feat: add nullable type converter

feat: add packet types from the packets assembly to PacketTypesRepository

feat: implement adding generated serializers

feat: add service collection extensions for adding packet serializer

feat: add base packet types converting