tests/benchmarks: Add VectorType deserialization benchmarks and expand test coverage

[mykaul]

Summary

• Add VectorType deserialization benchmark harness testing 4 strategies across multiple vector sizes and types
• Expand benchmark configurations to include larger vector sizes and more type combinations
• Enable vector integration tests on Scylla 2025.4+
• Add unit test coverage for variable-size VectorType Cython fallback and numpy large vector deserialization

Commits (4)

1. benchmarks: Add VectorType deserialization performance benchmark

New benchmarks/vector_deserialize.py (320 lines) testing:

• 4 strategies: VectorType.deserialize(), raw struct.unpack, numpy.frombuffer().tolist(), Cython DesVectorType
• Vector sizes: 3, 4, 128, 384, 768, 1536 (float); 128 (double, int)
• Iteration counts scaled by vector size for stable measurements

2. benchmarks: expand vector sizes

Add double[768], double[1536], int32[64] configurations.

3. tests: enable vector integration tests on Scylla 2025.4+

Re-enable vector integration tests that were previously skipped for Scylla. Tested against Scylla 2025.4.2 and 2026.1.

4. tests: add coverage for variable-size VectorType Cython fallback and numpy large vector deserialization

• Test that DesVectorType raises ValueError for variable-size subtypes (UTF8Type) while pure Python handles them
• Exercise the numpy deserialization path for 64-element vectors across float, double, int32, int64

No production code changes — benchmark and test files only.

[Copilot]

Pull request overview

Adds new benchmark and test coverage around VectorType deserialization, and refreshes integration test formatting to support vector-related testing scenarios.

Changes:

• Add a new benchmarks/vector_deserialize.py harness comparing multiple vector deserialization strategies across sizes/types.
• Add unit tests for VectorType large-vector deserialization and intended Cython fallback behavior.
• Reformat/clean up tests/integration/standard/test_types.py (imports/string literals/line wrapping) and keep vector test class enabled via @requires_vector_type.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 6 comments.

File	Description
tests/unit/test_types.py	Adds new unit tests for vector deserialization behavior (including a Cython-deserializer expectation).
tests/integration/standard/test_types.py	Largely formatting/refactoring; keeps/organizes vector integration tests under @requires_vector_type.
benchmarks/vector_deserialize.py	New benchmark script to measure vector deserialization performance across approaches and configurations.

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