Add a sleep timer for background player

[FaqatZubair1]

Checklist

• [X] I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• [X] I have read the FAQ and my problem isn't listed.
• [X] I'm aware that this is a request for Tubular itself and that requests for adding a new service need to be made in vanilla NewPipeExtractor.
• [X] I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the vanilla NewPipe contribution guidelines.

Feature description

When a video/playlist is played in background, there should be a sleep timer option, so that the pakyer closes automatically after some time.

Why do you want this feature?

Because I listen to a lot of podcasts, and they are usually in playlists, when I play something before sleep, it will keep playing until I turn it off myself. Or whenever I listen to my music playlist.

Why ist the feature relevant to this fork?

I requested the same feature on newpipe, the developers don't seem to care enough to implement it.

Additional information

No response

[DI555]

@polymorphicshade , could i ask please and for a wake/play timer also? Its would be the great stuff like alarm/wake/play option in the app! Many thanks in advance!