Add selectStream methods for large result sets

[simPod]

Summary

• Adds selectStream() and selectStreamWithParams() to ClickHouseClient interface and PsrClickHouseClient
• Returns raw PSR-7 StreamInterface instead of loading the full response into memory
• Allows incremental processing of large query results via read(), eof(), etc.

Test plan

• PHPStan passes (interface + implementation match)
• Manual testing with large result sets to verify streaming behavior
• Existing tests unaffected

https://claude.ai/code/session_01YX19TXMGf89gacogUmxHJM

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.41%. Comparing base (ddb1e57) to head (73797d6).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Client/PsrClickHouseClient.php	86.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   94.49%   94.41%   -0.09%     
==========================================
  Files          42       42              
  Lines         709      734      +25     
==========================================
+ Hits          670      693      +23     
- Misses         39       41       +2     

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