Grid Buffer
grid_tools
QgsProcessingParameterRasterLayer|FEATURES|Features Grid|None|False
QgsProcessingParameterNumber|DIST|Distance|QgsProcessingParameterNumber.Integer|1000|False|None|None
QgsProcessingParameterEnum|BUFFERTYPE|Buffer Distance|[0] Fixed;[1] Cell value
QgsProcessingParameterRasterDestination|BUFFER|Buffer Grid