Add comprehensive parallel index test with multiple index types

[zpf121]

Description:

This PR adds a new test test_multiple_index_types_parallel to verify concurrent read/write operations with various index types in Infinity database.

Test Overview:

4 write threads:
Insert rows with deterministic vector, multivector, text, and category data

8 read threads:
FullText: queries using match_text
Hnsw: vector search using match_dense on vector_col
Hnsw MV: vector search on tensor_col (multivector)
Secondary High: filter queries on id column (high cardinality)
Secondary Low: filter queries on category column (low cardinality)
Fusion RRF: combines fulltext and vector search with RRF fusion
Fusion MV RRF: combines two vector searches (regular + multivector)
Fusion Weighted Sum: combines fulltext and vector search with weighted_sum fusion

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.70%. Comparing base (e7774c5) to head (546e892).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3283       +/-   ##
===========================================
- Coverage   43.43%   29.70%   -13.73%     
===========================================
  Files         731      729        -2     
  Lines      153374   153350       -24     
  Branches    27750    27748        -2     
===========================================
- Hits        66619    45556    -21063     
- Misses      77239    99785    +22546     
+ Partials     9516     8009     -1507     

Flag	Coverage Δ
debug parallel test	?
debug pysdk test	29.70% <ø> (-0.20%)	⬇️
debug unit test	?

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