Impl register and add sub RPC

[jackgerrits]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 22 lines in your changes missing coverage. Please review.

Project coverage is 70.08%. Comparing base (db2410c) to head (f750682).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ext/runtimes/grpc/_worker_runtime_host_servicer.py	66.66%	17 Missing ⚠️
...utogen-ext/src/autogen_ext/runtimes/grpc/_utils.py	82.60%	4 Missing ⚠️
...t/src/autogen_ext/runtimes/grpc/_worker_runtime.py	96.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5191      +/-   ##
==========================================
- Coverage   70.42%   70.08%   -0.34%     
==========================================
  Files         178      179       +1     
  Lines       11581    11620      +39     
==========================================
- Hits         8156     8144      -12     
- Misses       3425     3476      +51     

Flag	Coverage Δ
unittests	70.08% <77.77%> (-0.34%)	⬇️

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[ekzhu]

I like how right now the non-messaging APIs are separate from messaging API. It is much cleaner that way.