Add playback settings to TV demo app

[MGaetan89]

Pull request

Description

This PR adds the ability to change the playback speed, audio language, and subtitle language.

Changes made

• Update TvPlayerView to display a settings icon, which allows the user to change the audio track, subtitle, and playback speed
• Update all the *AsState() method methods to actually return a State
• Update the Modifier.handleDPadKeyEvents so it uses Compose's type and supports up/down events too
• Fix some of the Lint warnings reported here

Screenshots

Description	Screenshot
Settings menu
Audio track setting
Subtitle setting
Speed setting
Updated settings menu

Checklist

• Your branch has been rebased onto the main branch.
• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).
• All pull request status checks pass.