Add a subtitle offset

[killerrook]

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 NewPipe itself and that requests for adding a new service need to be made at 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 contribution guidelines.

Feature description

Ability to adjust the timing offset for an external text-based subtitle.

Here is a visual example

See right side

Why do you want this feature?

Sometimes subtitles go out of sync check #9208

Additional information

No response

[opusforlife2]

Don't just assume the problem exists before investigating it thoroughly.

[killerrook]

Well since the problem still exists with YouTube so I believe it will be a nice addition which will enhance user experience.

Could you please reopen this issue? So that others may also get an opportunity to comment what they think of it? 😥