DiffWorkspaceConfig performs a difference between two WorkspaceConfig and produces a set of []types.WorkspaceChange It is the inverse function of ApplyChanges as seen here: ApplyChanges(current, DiffConfig(current, desired)) == current This function performs a set difference or symmetric difference of current and desired This is represented by AΔB or A⊖B where A=current, B=desired This contains objects that belong to A or B, but not their intersection This results in a set of workspace changes (add, remove, update) - add: B-A (config in desired, not in current) - remove: A-B (config in current, not in desired) - update: A⋂B (config in current and desired, value changed).