gaussian_contrast_stretch
Gaussian contrast stretch
Image processing
https://www.whiteboxgeo.com/manual/wbw-user-manual/book/tool_help.html#gaussian_contrast_stretch
QgsProcessingParameterRasterLayer|inputRaster1|Raster (Raster)|None|False
QgsProcessingParameterNumber|num_tones2|Num tones (int)|QgsProcessingParameterNumber.Integer|256|False|None|None
QgsProcessingParameterRasterDestination|fnOutput|Output (Raster)|None|False
