Inheriting from Argument() in order to represent the UDF code that will be executed in a UDF call. The script has to
be passed as a character string or as a local file path from which the script can be loaded.
Object of R6Class() is an argument that expects an UDF code or a file path.
Array(), Integer(), EPSGCode(), String(), Number(),
Date(), RasterCube(), VectorCube(), ProcessGraphArgument(),
ProcessGraphParameter(), OutputFormatOptions(), GeoJson(),
Boolean(), DateTime(), Time(), BoundingBox(), Kernel(),
TemporalInterval(), TemporalIntervals(), CollectionId(), OutputFormat(),
AnyOf(), ProjDefinition(), UdfCodeArgument(), UdfRuntimeArgument() and
UdfRuntimeVersionArgument(),TemporalIntervals(), MetadataFilter()