feat: add skip_transpose flag to vector index builders

[BubbleCal]

set skip_transpose=True to let the vector index builder not transpose the quantized vectors, this is useful for distributed indexing as we don't need to do inverse transpose and transpose again when we merge indices

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 94.89796% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
rust/lance/src/index/vector.rs	64.28%	5 Missing ⚠️

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