Add checkboxes to batch add videos to specific playlists

[dfirnewbie]

Checklist

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

Feature description

Add a checkbox after long pressing a video to select multiple videos to be added to a playlist from a channel.

Why do you want this feature?

I think this is easier than long pressing each video one by one in a channel then adding to it to a customized playlist.

Additional information

No response

[SameenAhnaf]

#8584