[8.2] MOD-14470 Add VecSimParams_GetQueryBlobSize API for safe query vector allocatio

[github-actions]

Description

Backport of #915 to 8.2.

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Note

Low Risk
Low risk: adds a small, self-contained C API helper and unit coverage without changing indexing/search behavior. Main risk is API/ABI exposure and relying on assert for type validation in release builds.

Overview
Adds a new public C API, VecSimParams_GetQueryBlobSize, to compute the required allocation size for query vector blobs that will be passed through VecSim_Normalize, including the extra float norm storage needed for INT8/UINT8 cosine queries.

Updates unit tests to cover the new helper across {VecSimType, VecSimMetric} combinations and hardens CommonTypeMetricTests teardown to avoid freeing a null index.

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[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.01%. Comparing base (8e80775) to head (40407c6).
⚠️ Report is 2 commits behind head on 8.2.

Additional details and impacted files

@@            Coverage Diff             @@
##              8.2     #921      +/-   ##
==========================================
- Coverage   97.03%   97.01%   -0.03%     
==========================================
  Files         126      126              
  Lines        7353     7359       +6     
==========================================
+ Hits         7135     7139       +4     
- Misses        218      220       +2     

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