refactor: remove gRPC dependencies and related configurations

[elitonzky]

• Removed gRPC-related packages from poetry.lock and pyproject.toml.
• Eliminated gRPC client implementations and service definitions from the codebase.
• Updated environment variables and settings to reflect the removal of gRPC functionality.
• Cleaned up serializers and URLs that were previously dependent on gRPC.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.33%. Comparing base (33be722) to head (2dfd72f).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #738      +/-   ##
==========================================
- Coverage   76.37%   76.33%   -0.05%     
==========================================
  Files         196      195       -1     
  Lines        7011     6982      -29     
==========================================
- Hits         5355     5330      -25     
+ Misses       1656     1652       -4     

Flag	Coverage Δ
annotations	76.33% <100.00%> (-0.05%)	⬇️
path	76.33% <100.00%> (-0.05%)	⬇️
test_changes	76.33% <100.00%> (-0.05%)	⬇️

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