[Tablet] Allow mapping to entire monitor layout

[Agent00Ming]

Describe your PR, what does it fix/add?

Fixes #6023.
Moves monitor layout entire area search to a function and enables tablets to map to the entire monitor layout. This allows OpenTabletDriver's monitor mapping settings to work on artist mode.

Optionally enabled via input:tablet:output = entire

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

Tested working with OTD on artist mode. Does not work with OTD absolute mode (virtual device is listed alongside normal mice in hyprctl devices). Related: #6889

Is it ready for merging, or does it need work?

Ready.

[Stoppedpuma]

This doesn't seem to work correctly in applications. On the desktop it seems to work fine though.

1725034082.webm

[Agent00Ming]

Well what about everything except osu? Because it seems like it grabs the input for itself once focused. Cursor lock -> tablet input redirected to cursor lock region it seems.

[Stoppedpuma]

I can't seem to reproduce this outside of osu! but I also don't really have many applications to test with. My guess on why this happens is Hyprland isn't resizing the window correctly, usually when resizing osu! it will show a toast with the new resolution, this doesn't seem to happen under Hyprland for some reason.

Resize toast example in Sway:

1725036452.mp4

[Agent00Ming]

The resolution change toast not appearing is somewhat unrelated. Tablet input mapping to cursor lock region could be changed another day as it's not the focus of this PR.