Shrink and Expand
grid_tools
QgsProcessingParameterRasterLayer|INPUT|Grid|None|False
ParameterSelection|OPERATION|Operation|[0] Shrink;[1] Expand;[2] shrink and expand;[3] expand and shrink|3
ParameterSelection|CIRCLE|Search Mode|[0] Square;[1] Circle
QgsProcessingParameterNumber|RADIUS|Radius|QgsProcessingParameterNumber.Integer|1|False|1|None
ParameterSelection|EXPAND|Method|[0] min;[1] max;[2] mean;[3] majority|3
QgsProcessingParameterRasterDestination|RESULT|Result Grid