* Move `namer.h` and `idl_namer.h` to `include/codegen` so they can be reused from `grpc` dirqectory.
* [gRPC] Update the Python generator to produce typed handlers and Python stubs if requested.
* [gRPC] Document the newly added compiler flags.
Refactored python grpc code gen
Adds example server & client + fixes ci
Fixes generated code
Making sure we encode the reply string as utf8
Adds Readme details to clarify issue regarding encoding when python is sending/receiving
