fix: mutable query detection

[OpenGaet]

Fixes a bug that incorrectly raised an exception when executing select statements when allow_write is false.

Summary

Changes

• Enhanced SQL mutation detection: Added new mutable_sql_detector.py utility with comprehensive keyword detection for SQL operations that modify data
• Improved write access control: Replaced simple string matching with robust pattern matching to detect mutating SQL operations (INSERT, UPDATE, DELETE, CREATE, DROP, ALTER, etc.)
• Better error handling: More specific error messages when mutating operations are attempted without write access
• Code reorganization: Moved query execution logic earlier in the flow for better validation sequencing

User experience

User will no longer experience a fatal bug when executing select statements with allow_write set to false.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? N

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the project license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.50%. Comparing base (f8ac8dc) to head (d09c9da).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1511   +/-   ##
=======================================
  Coverage   89.50%   89.50%           
=======================================
  Files         730      731    +1     
  Lines       51332    51345   +13     
  Branches     8166     8167    +1     
=======================================
+ Hits        45943    45956   +13     
  Misses       3474     3474           
  Partials     1915     1915           

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