fix: MoveOperation path comparisons

[shellbj]

This commit fixes a defect in the MoveOperation's path comparisons for trees belonging to the same root. Comparisons are now done on each path element, individually, with the destination's elements; properly determining if it's a subtree or not.

This is now a valid patch:

[
     { "op": "move", "from": "/a/b/c", "path": "/a/b/cdefg" }
]