feat(rust/sedona-raster-functions): add RS_Value#974
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Add RS_Value to sample a raster pixel value at a point or 1-based grid cell (2-D). Reads materialised InDb pixel bytes directly from the band's NdBuffer via stride-offset math and marks the UDF needs_pixels so the planner injects RS_EnsureLoaded — no GDAL dependency. Returns null for out-of-bounds locations and nodata pixels; errors on non-2-D bands.
Add RS_Value cases (grid, point, and point+band) to the consolidated native-raster-functions Criterion bench, alongside the other RS_* kernels.
…d band handling - Floor (not truncate toward zero) the inverse transform so a point just outside the top/left edge is out of bounds rather than sampling an edge pixel. - Require a 2-D spatial (y, x) band via is_spatial_2d, not any two-axis band. - Propagate a NULL band argument to a NULL result; reject band 0/negative rather than coercing to band 1. - Document why the pixel read uses the lossless f64 conversion. - Add tests: floor edge case, NaN nodata, band 0, and the point CRS-mismatch / non-point-geometry error paths.
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