Move BufferHandle into vortex-array

[gatesn]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 36.11111% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.98%. Comparing base (2e137f2) to head (1ea5db6).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
vortex-array/src/buffer.rs	33.33%	16 Missing ⚠️
vortex-array/src/hash.rs	0.00%	6 Missing ⚠️
vortex-array/src/serde.rs	50.00%	1 Missing ⚠️

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