chore: re-export BtrBlocksCompressorBuilder in vortex crate

[haohuaijin]

Does this PR closes an open issue or discussion?

• Closes #.

What changes are included in this PR?

re export the BtrBlocksCompressorBuilder in the vortex crate

What is the rationale for this change?

i see we export BtrBlocksCompressor in vortex crate, seem like no reason not export it Builder struct

How is this change tested?

Are there any user-facing changes?

[codspeed-hq]

Merging this PR will improve performance by 35.59%

⚡ 5 improved benchmarks
✅ 1130 untouched benchmarks
⏩ 1268 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	take_map[(0.05, 1.0)]	4.1 ms	3.1 ms	+31.32%
⚡	Simulation	take_map[(0.05, 0.1)]	792 µs	592.1 µs	+33.77%
⚡	Simulation	take_map[(0.1, 0.5)]	2.8 ms	2 ms	+35.59%
⚡	Simulation	take_map[(0.1, 1.0)]	4.7 ms	3.5 ms	+33.92%
⚡	Simulation	take_map[(0.1, 0.1)]	1,118.8 µs	924.8 µs	+20.99%

---

_{Comparing haohuaijin:re-export-builder (103a1e6) with develop (aa55054)}

Footnotes

1. 1268 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩