[Feature Request]: Audio Only setting for playlists

### Guidelines

- [X] I have searched the issue tracker for [open](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aopen+is%3Aissue) and [closed](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+is%3Aclosed) issues that are similar to the feature request I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the feature request I want to file, without success.
- [X] This issue contains only one feature request.

### Problem Description

Free up bandwith & reduce distractions while listening to music only playlists. Currently the only way to achieve this with music only playlists is, with each new video played, manually toggle the video settings to Audio Format.

### Proposed Solution

Add the ability in the playlist settings to set the default video format for the videos in the playlist to "Audio Formats". The intention being that if the user views the video normally, the player default video format will set the videos format, but if they specifically click into their playlist and play the whole list, the set playlist-specific video format will determine the video format.

Perhaps one solution for this, instead of in the playlist settings, add a Format button similar to the regular video player Format button to the playlist toggles where the user could set their perferred video format and it would apply to all the videos in the playlist. See attached.

### Alternatives Considered

The only alternatives I can think of would be:
- Keep the video player minimized/ignore it
- With each new video played, manually set the video format
- Or in the main setting change the default video format to audio, and if theres a video I want to watch, manually set the video format for it.

### Issue Labels

ease of use improvement, new optional setting

### Additional Information

_No response_