feat: Nack support for Sources

[BulkBeing]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.53%. Comparing base (ac2b513) to head (bb27dc8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pynumaflow/sourcer/servicer/async_servicer.py	75.00%	3 Missing ⚠️
pynumaflow/sourcer/_dtypes.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   93.62%   93.53%   -0.10%     
==========================================
  Files          65       65              
  Lines        2888     2909      +21     
  Branches      152      152              
==========================================
+ Hits         2704     2721      +17     
- Misses        134      138       +4     
  Partials       50       50              

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[vigith]

lot of files have been changed since the gRPC version changed, can you try to avoid that?

[BulkBeing]

lot of files have been changed since the gRPC version changed, can you try to avoid that?

I only ran make proto. We are using protobuf version 6.32.1. The generated code in the main shows:

# Protobuf Python Version: 4.25.1

The 4.x version is already end of support https://protobuf.dev/support/version-support/#python
It looks like we were not committing generated code to Github.

[BulkBeing]

Created smaller PRs #250 and #252