impl(bigquery): add query errors

[alvarowolfx]

Towards #5844

[alvarowolfx]

Split from #5870

[gemini-code-assist]

Code Review

This pull request introduces a custom QueryError enum using the thiserror crate to handle errors during BigQuery query operations, along with corresponding unit tests. The reviewer suggested adding the #[from] attribute to the Rpc error variant to automatically derive the From trait, enabling cleaner error propagation using the ? operator.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.88%. Comparing base (83e24b6) to head (592465f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5873      +/-   ##
==========================================
- Coverage   97.88%   97.88%   -0.01%     
==========================================
  Files         229      230       +1     
  Lines       58080    58104      +24     
==========================================
+ Hits        56851    56873      +22     
- Misses       1229     1231       +2     

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