feat(arrow) ArrowGPUVector improvements

[ibgreen-openai]

Goals

• Improve Arrow GPU buffer ownership semantics.
• Support constructing ArrowGPUVector and ArrowGPUTable from existing GPU buffers/vectors.
• Document GPU memory layouts: packed, interleaved, and segmented.
• Prepare Arrow GPU objects for future compute/GPGPU workflows without changing GPGPU core classes.

Changes

• Added discriminated ArrowGPUVector construction:
  • type: 'arrow' uploads Arrow vector data.
  • type: 'buffer' wraps an existing typed GPU buffer.
  • type: 'interleaved' wraps an interleaved GPU buffer as Arrow Binary.
• Added name, byteOffset, byteStride, optional bufferLayout, and ownership tracking to ArrowGPUVector.
• Added ArrowGPUVector.transferBufferOwnership() for in-place/reinterpreted buffer workflows.
• Updated ArrowGPUVector.destroy() to destroy only owned buffers.
• Added new ArrowGPUTable({vectors}) construction from named GPU vectors.
• Derived ArrowGPUTable schema, rows, columns, buffer layouts, and attributes from supplied vectors.
• Added support for interleaved vector metadata in ArrowGPUTable.
• Added @luma.gl/arrow as a @luma.gl/gpgpu dependency and TypeScript project reference.
• Added GPU memory layout documentation for packed, interleaved, and segmented buffers.
• Updated Arrow docs/README with ownership semantics.

Tests

• Added tests for ArrowGPUVector constructor variants and ownership transfer.
• Added tests for ArrowGPUTable({vectors}), including interleaved layouts.
• Ran corepack yarn build.
• Ran targeted headless tests:
  • modules/arrow/test/arrow/arrow-fixed-size-list.spec.ts
  • modules/arrow/test/arrow/plain-gpu-table.spec.ts