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[GDAL provider] Expose GDAL mask band as a pseudo alpha band.
Some TIFF formulations, for example RGB TIFF with JPEG YCbCr compression, cannot include a regular alpha band and instead use the GDAL mask band mechanism. Such mask bands were ignored up to now. Now expose them as if they were alpha bands.
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tests/testdata/raster/rgb_with_mask.tif
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