feat(vortex-spatial): add area scalar function

[HarukiMoriarty]

Summary

• add a native GeoArea scalar function backed by geo::Area::unsigned_area
• support every native geometry dtype, including zero-area point and line families and rectangular boxes
• preserve input nullability and propagate null rows through unary columnar execution
• give every geo scalar function a local operand validator that checks exact arity before dtype validation
• parameterize repeated Area, Envelope, and MakeLine cases with rstest for clearer per-dtype failures and broader operand-order coverage

Semantics

This follows DuckDB ST_Area semantics over the native Vortex geometry types: point and line families return zero, polygon holes are subtracted, multipolygon component areas are summed, rectangles use width times height, and higher coordinate dimensions are ignored. WKB remains excluded because it is a storage representation rather than a native decoded geometry.

[codspeed-hq]

Merging this PR will regress 1 benchmark

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 1949 untouched benchmarks
🆕 7 new benchmarks
⏩ 89 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	cold_misaligned[(64, 256)]	4.4 ms	5.3 ms	-16.88%
⚡	Simulation	decompress[u64, (1000, 16)]	73.6 µs	65 µs	+13.16%
⚡	Simulation	compress_fsst[(1000, 64, 8)]	1.2 ms	1 ms	+13.04%
🆕	Simulation	column_x_column	N/A	212.7 µs	N/A
🆕	Simulation	column_x_constant	N/A	586.6 µs	N/A
🆕	Simulation	nullable_columns	N/A	234.6 µs	N/A
🆕	Simulation	multipolygon	N/A	2.7 ms	N/A
🆕	Simulation	nullable_polygon	N/A	1.4 ms	N/A
🆕	Simulation	polygon_with_holes	N/A	2.3 ms	N/A
🆕	Simulation	simple_polygon	N/A	1 ms	N/A

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

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_{Comparing nemo/geo-area (0f145ec) with develop (9157d6c)²}

Footnotes

1. 89 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. ↩

2. No successful run was found on develop (c61095f) during the generation of this report, so 9157d6c was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[connortsui20]

I really need to get my rowfn stuff in