feat(YouTube - Overlay Buttons): Add Set Brightness button

[Francesco146]

ref: anddea/revanced-patches#818

[Francesco146]

todo:

• understand how to add android.permission.WRITE_SETTINGS in the manifest
• understand how can i restore control over the brightness when the video is closed
• understand why previousBrightness is always -1.0 after the first initialization
• tap and hold doesn't work
• dynamic icon seems to not work in tap

[Francesco146]

now the implementation is almost done, it would be better to change the system brightness instead of the application brightness

edit:

understand how can i restore control over the brightness when the video is closed

this could be resolved by adding the android.permission.WRITE_SETTINGS permission