Handle tablet input (stylus)

## What problem does this solve or what need does it fill?

Handling drawing tablet input would improve bevy usage in drawing applications.

## What solution would you like?

Handle winit's tablet input events (introduced in [PR-4318](https://github.com/rust-windowing/winit/pull/4318)) and make them available to developers just like mouse input but with tablet input parameters like pressure and tilt direction.

## What alternative(s) have you considered?

Currently pen tablet input is picked up as mouse input if I remember correctly.

## Additional context

The required winit changes are not released in 0.30.12 (which is the current latest version). Implementation should wait until they are released.

Start by reviewing Bevy’s existing mouse-input handling and winit’s tablet input events after the required winit release is available. Done means tablet input is exposed to Bevy developers with parameters such as pressure and tilt direction, rather than being handled only as mouse input.

Written by the indexing model from the issue text.