impl(bigquery): parse numeric types as decimal

[alvarowolfx]

Towards #5844

[gemini-code-assist]

Code Review

This pull request implements the FromSql trait for i32, f32, google_cloud_type::model::Decimal, and rust_decimal::Decimal in the BigQuery crate, accompanied by comprehensive unit and integration tests. The review feedback recommends using standard FromStr parsing via str::parse instead of rust_decimal::Decimal::from_str_exact to ensure robust handling of scientific notation and formatting variations.

[alvarowolfx]

/gemini review

[gemini-code-assist]

Code Review

This pull request implements the FromSql trait for i32, f32, google_cloud_type::model::Decimal, and rust_decimal::Decimal to expand support for numeric types in BigQuery queries, accompanied by comprehensive unit and integration tests. The feedback suggests optimizing the FromSql implementation for rust_decimal::Decimal by avoiding intermediate string allocations and parsing when converting from serde_json::Number, recommending direct numeric conversions instead.

[codecov]

Codecov Report

❌ Patch coverage is 97.79412% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.04%. Comparing base (e0ead5f) to head (c8d1510).

Files with missing lines	Patch %	Lines
src/bigquery/src/query/from_sql.rs	96.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6044      +/-   ##
==========================================
+ Coverage   97.02%   97.04%   +0.01%     
==========================================
  Files         253      253              
  Lines       63547    63682     +135     
==========================================
+ Hits        61655    61798     +143     
+ Misses       1892     1884       -8     

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