list_unique_values_raster
List unique values raster
Math
https://www.whiteboxgeo.com/manual/wbw-user-manual/book/tool_help.html#list_unique_values_raster
QgsProcessingParameterRasterLayer|inputRaster1|Raster (Raster)|None|False
QgsProcessingParameterFileDestination|fnOutput|Output (str)|Text files (*.txt *.TXT)|None|False
