Button to manually enable landscape video viewing

[PimpinPumpkin]

Checklist

• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

Describe the feature you want

It would be fantastic if there was a button to manually enter landscape full screen in both the mini player and the video player inside NewPipe itself. The vanilla YouTube client has this within YouTube, and it's very handy if your device auto rotate is unreliable or you're watching a video lying down.

Is your feature request related to a problem? Please describe it

Additional context

How will you/everyone benefit from this feature?

This feature is a simple touch that will enhance the experience for those with auto rotate disabled, or those who wish to watch videos lying down without the frustration of the video switching back to vertical mode.

[develop1st]

#5799 will serve as a workaround. When the screen is locked, orientation gets locked in as well.

[SameenAhnaf]

Closing in favor of #4478 and #5239 (comment) for main and mini player parts respectively