[Feature Request] Clearing the canvas cannot be undone

## Description
When a user clears the canvas it is cleared immediately and there is no way to undo or go back.

This is unfortunate when done on accident.


## Preferred Solution

The simplest approach would be to add a confirmation modal to the process to ensure the user is aware that the action cannot be undone.

If we had a way to snapshot the graph in the canvas and restore that snapshot, we could offer an undo action (potentially viable after #298)

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