Function read_raster_band

pub fn read_raster_band<T: RasterType>(
    raster_path: &Path,
    band_index: usize,
    offset: (isize, isize),
    window_size: (usize, usize),
) -> Array2<T>

Reads a raster band window into a 2D array.

Replaces the duplicated Dataset::open → rasterband → read_as → to_array pattern found in io.rs::read_block(), io.rs::read_block_layer_idx(), and processing.rs::read_block_hybrid().