serializer of choice

[nycholas]

Discussed in https://github.com/cenobites/flask-jsonrpc/discussions/707

^{Originally posted by alexted December 7, 2025} Hello! Thank you for your work - it's incredible. Looking at Litestar's success, I would like to ask you - could you add [optional] support for de/serialization using msgspec? I want to be able to choose which serialization tool I will use - pydantic, msgspec, or some other. Thank you!