Refactor `spo file` to use util instead of calling other command

[nicodecleyre]

In this issue the following using of commands is refactored:

Command	The command to refactor	Util function
spo file roleassignment add	SpoUserGetCommand	spo.getUserByEmail
	SpoGroupGetCommand	spo.getGroupByName
	SpoRoleDefinitionListCommand	spo.getRoleDefinitionByName
	SpoFileGetCommand	spo.getFileById
spo file roleassignment remove	SpoFileGetCommand	spo.getFileById
	SpoUserGetCommand	spo.getUserByEmail
	SpoGroupGetCommand	spo.getGroupByName
spo file roleinheritance break	SpoFileGetCommand	spo.getFileById
spo file roleinheritance reset	SpoFileGetCommand	spo.getFileById

This issue is part of the epic #4531