For PM-1898 we need an extra boolean attribute to be associated with files called forPlanning (should default to false) that allows users to indicate that a file is to be used for planning purposes. usually such files will be associated with sub workflow jobs.

please update the json schema first and push changes, followed up the python api changes.
the attribute should be printed out similar to other attributes (if set). also update and add new the python unit tests to reflect the new attribute

Also remember that the python api now needs to output 5.0.4 in the version attribute of the abstract workflows.