Add RS_Rotation

[jesspav]

Adding function RS_Rotation

Example:

> select rs_rotation(RS_Example());
┌───────────────────────────┐
│ rs_rotation(rs_example()) │
│          float64          │
╞═══════════════════════════╡
│        0.4636476090008061 │
└───────────────────────────┘

Bench:

native-raster-rs_rotation-Array(Raster(64, 64))
                        time:   [795.28 µs 796.17 µs 797.00 µs]

[Copilot]

Pull request overview

This PR adds a new RS_Rotation function that calculates the rotation angle (in radians) of a raster based on its geotransform metadata. The rotation is computed using atan2(skew_y, scale_x).

Key changes:

• Implements core rotation() function in the affine transformation module
• Adds RS_Rotation UDF with corresponding documentation
• Includes comprehensive unit tests covering multiple rotation angles (0°, 45°, 60°, 90°, 180°)

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
rust/sedona-raster/src/affine_transformation.rs	Adds rotation() function and comprehensive test cases
rust/sedona-raster-functions/src/rs_geotransform.rs	Implements RS_Rotation UDF with documentation and test coverage
rust/sedona-raster-functions/src/register.rs	Registers the new rs_rotation_udf function
rust/sedona-raster-functions/benches/native-raster-functions.rs	Adds benchmark for rs_rotation

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[paleolimbot]

Thank you!