Add gdal_footprint utility #7992
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The gdal_footprint utility can be used to compute the footprint of a raster file, taking into account nodata values (or more generally the mask band attached to the raster bands), and generating polygons/multipolygons corresponding to areas where pixels are valid, and write to an output vector file. Fixes OSGeo#6264
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The gdal_footprint utility can be used to compute the footprint of
a raster file, taking into account nodata values (or more generally the mask
band attached to the raster bands), and generating polygons/multipolygons
corresponding to areas where pixels are valid, and write to an output vector file.
Documentation at https://github.com/rouault/gdal/blob/gdal_footprint/doc/source/programs/gdal_footprint.rst
Fixes #6264