[Future Pull Request]: Add [AltGr] key to be able to type with ten digits on screen.

[jidhub]

I have made a fork, with an AltGr key. This is similar to the shift key, and can be combined or not with shift key. This allows faster french typing. It is also used in other langages.

The code is barely tested, so I need to test it more before I make a Pull Request.

Also, I chose shift and AltGr to never be deadkeys nor lockable, the aim is to type with my ten digits on my Android screen. This is working for me. I can add this in the same Pull Request, or I can make a separate pull request for that. Feedback welcome.

Android OS version: Android 14 UP1A.231005.007.F926BXXS6GXBD

Device manufacturer and model: samsung Fold 3 SM-F926B

List of installed add-ons (like languages, or themes): french add-on