Description of the new feature/enhancement

As part of the discussion in #968 there was a suggestion that, while creating a selection was a good cue for enabling a smart copy mode, there was no equivalent cue for smart paste.

Implementing a paste mode may be a good addition to assist those that wish to use Ctrl+V as both a paste key and a key combination in terminal apps.

Proposed technical implementation details (optional)

My idea is frankly quite vague. Apologies if it feels unreasonable.

Perhaps the terminal could, on app activation and in the event of a clipboard addition, detect the presence of a compatible item in the clipboard and enable a paste 'mode'. This would provide a visual cue that the paste keybinding(s) would paste rather than be sent through to the terminal. Once in this mode, an opportunity to cancel the mode would be available to the user, through a UI element and/or another keybinding.