Expose expressions for C API

[myrrc]

Expose a subset of expressions to test filtering in Scan API:
root, column, get_item, select, or, not, is_null, and binary operators, including shortcuts like eq.
Add vx_array_apply to test C-side expression application.

This patch does not include C++ FFI tests because we can't create vx_arrays' yet, #7148.
The next steps are exposing literal expressions and dynamic expressions.

[codspeed-hq]

Merging this PR will degrade performance by 15.51%

❌ 2 regressed benchmarks
✅ 1104 untouched benchmarks
⏩ 1522 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	bitwise_not_vortex_buffer_mut[1024]	477.2 ns	535.6 ns	-10.89%
❌	Simulation	bitwise_not_vortex_buffer_mut[128]	317.8 ns	376.1 ns	-15.51%

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_{Comparing myrrc/expressions-ffi (bc6ab5f) with develop (b524763)}

Footnotes

1. 1522 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. ↩