refactor(rust/sedona-raster-functions): Split monolithic benchmark into per-function benchmark files

[Kontinuation]

Summary

• Split benches/native-raster-functions.rs into separate per-function benchmark files: rs_envelope, rs_geotransform, rs_rastercoordinate, rs_size, rs_srid, and rs_worldcoordinate
• Updated Cargo.toml [[bench]] entries to match the new file names
• Added multi-size benchmarks (64x64, 256x256, 1024x1024) for rs_envelope, rs_size (width/height)

Rationale

We will add more raster functions later, having a monolithic benchmark file does not scale, so we'd better break it into several smaller files.

[Copilot]

Pull request overview

Refactors the Rust raster-function benchmarks by splitting a single monolithic benchmark into multiple per-function benchmark targets and expanding coverage for some functions across multiple raster sizes.

Changes:

• Added new criterion benchmark files per function group (rs_envelope, rs_geotransform, rs_rastercoordinate, rs_size, rs_srid, rs_worldcoordinate).
• Updated Cargo.toml bench targets to match the new benchmark filenames.
• Added multi-size benchmark runs (64x64, 256x256, 1024x1024) for envelope and size (width/height).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rust/sedona-raster-functions/benches/rs_worldcoordinate.rs	Adds Criterion benchmarks for raster→world coordinate functions.
rust/sedona-raster-functions/benches/rs_srid.rs	Adds benchmarks for SRID/CRS accessors.
rust/sedona-raster-functions/benches/rs_size.rs	Adds multi-size benchmarks for width/height functions.
rust/sedona-raster-functions/benches/rs_rastercoordinate.rs	Removes unrelated benches and focuses file on world→raster coordinate benchmarks.
rust/sedona-raster-functions/benches/rs_geotransform.rs	Adds benchmarks for geotransform-derived properties (scale/rotation/skew/upper-left).
rust/sedona-raster-functions/benches/rs_envelope.rs	Adds multi-size benchmarks for envelope computation.
rust/sedona-raster-functions/Cargo.toml	Replaces the single native-raster-functions bench entry with per-file bench entries.

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[Kontinuation]

Most of the benchmarks in this module are just a few lines, splitting them to multiple files may not be a good idea.