feat(sedona-gdal): add raster operations and vrt support

[Kontinuation]

Summary

• add VRT dataset support plus rasterize, rasterize-affine, and polygonize wrappers
• layer higher-level raster operations on top of the dataset/raster/vector wrapper stack
• remove raster wrapper re-export aliases so call sites import concrete module paths directly

Stack

• foundation and primitives are already merged into main via feat(sedona-gdal): add foundational wrapper utilities #696 and feat(sedona-gdal): add geometry and spatial ref primitives #695
• this branch now depends on feat(sedona-gdal): add dataset and vector/raster wrappers #699 rebased onto current main

Follow-up since primitives merged

• rebase onto the updated safe-core branch
• use GdalApi::last_null_pointer_err instead of constructing GdalError::NullPointer directly
• keep explicit module-path imports after removing raster re-export aliases

Testing

• cargo test -p sedona-gdal
• cargo clippy -p sedona-gdal -- -D warnings

[Copilot]

Pull request overview

Adds new GDAL raster operation wrappers and VRT dataset support to the sedona-gdal safe wrapper layer, building on the existing dataset/raster/vector abstractions.

Changes:

• Introduces VrtDataset/VrtRasterBand wrappers with VRT creation, band add, simple source, and nodata helpers.
• Adds raster operations: rasterize, rasterize_affine (fast geotransform-only path), and polygonize, with tests.
• Exposes the new modules via raster.rs and lib.rs.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
c/sedona-gdal/src/vrt.rs	New VRT dataset and band wrappers + tests
c/sedona-gdal/src/raster/rasterize.rs	New GDALRasterizeGeometries wrapper + options + tests
c/sedona-gdal/src/raster/rasterize_affine.rs	New fast affine rasterize wrapper using custom transformer + tests
c/sedona-gdal/src/raster/polygonize.rs	New GDALPolygonize wrapper + options + tests
c/sedona-gdal/src/raster.rs	Exposes new raster modules
c/sedona-gdal/src/lib.rs	Exposes new vrt module

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[paleolimbot]

Thank you!