Rewrite BatteryOptimizationsPage to M3

[ArnyminerZ]

The PR should be in Draft state during development. As soon as it's finished, it should be marked as Ready for review and a reviewer should be chosen.

See also: Writing A Great Pull Request Description

Purpose

Update design of the battery optimizations intro page so that it uses M3.

Also updates the architecture of the activity-viewmodel-composables relationship so that it follows best practices as discussed internally, and as recommended by Google.

Short description

• Replaced M2's typographies with M3:
  • MaterialTheme.typography.body1 :: MaterialTheme.typography.bodyLarge
  • MaterialTheme.typography.body2 :: MaterialTheme.typography.bodyMedium
  • MaterialTheme.typography.h6 :: MaterialTheme.typography.labelLarge
• All logic has been moved to the ViewModel, no more settings updates in the composable.
• All callback arguments in composables have {} by default so that it's not required in preview.

Checklist

• [x] The PR has a proper title, description and label.
• [x] I have self-reviewed the PR.
• [x] I have added documentation to complex functions and functions that can be used by other modules.
• [x] I have added reasonable tests or consciously decided to not add tests.

[ArnyminerZ]

Should be ready :)

[ArnyminerZ]

dontShowBattery checkbox is not selectable/updated when tapped anymore.

I'm working on it

[rfc2822]

Please rebase to main-ose (better DI)