feat: error handling

[LingKa28]

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)
  Add new feature error handling

• what changes does this pull request make?

  • add grpc error handling.

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)
  No.

[codecov]

Codecov Report

Attention: 96 lines in your changes are missing coverage. Please review.

Comparison is base (897d3d2) 91.46% compared to head (53d53de) 83.78%.

Files	Patch %	Lines
client/protocol.py	46.36%	90 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   91.46%   83.78%   -7.68%     
==========================================
  Files          18       18              
  Lines        1031     1104      +73     
  Branches       60       83      +23     
==========================================
- Hits          943      925      -18     
- Misses         63      150      +87     
- Partials       25       29       +4     

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