[Intent FEATURE REQUEST] UndoIntent to undo previous commands {upto 3 times}

[Vibhu-Agarwal]

UndoIntentHandler for handing undo feature.
Define UNDO_QUEUE_SIZE as a global variable which states how many undo(s) we can do.

How it works

Using Fixed-sized queue of size UNDO_QUEUE_SIZE which stores full copies of states as an element. Map the element popped from queue into current session attributes when undo-ed.

Utterances Format:

• "Undo the previous command"

Slots

None