Correctly restore Control position on undoing an Anchors Preset

[TheSofox]

Fixes #85245

Ensures that the user changing Anchors Preset or Layout Mode on a Control will have correct Undo behaviour (ie. It'll return to its previous position as expected).

[TheSofox]

Rebased PR. Did some quick testing to confirm it still resolves the bug.

[KoBeWi]

Anchor presets are set via internal _set_anchors_layout_preset method. Instead of hard-coding a specific property in the inspector, you can modify the setter to use _edit_set_state() when editor hint is active.

[TheSofox]

I understand not wanting to put stuff in editor_inspector.cpp, but I'm not sure where else to put it. The setter _set_anchors_layout_preset() method doesn't know whether it's an undo or redo or regular operation. The problem is that changing the anchor immediately resets attributes such as position and size, so those values need to be stored somewhere so they can be restored on an undo, but I don't know how to do this from the _set_anchors_layout_preset() when I can't seem to access the UndoRedo queue or even whether I should be accessing it from there.

[KoBeWi]

A proper solution could be adding _edit_get_undo() method to Node, which would allow override the undo property in the class itself, but this PR will do for now.

[Repiteo]

Thanks!