Frame step back and forward

[foxjaw]

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

Provide two buttons: Frame step forward
Frame step backward

Why do you want this feature?

While submitting sponsorblock segments, we need to pause at precise moments to mark the start and end. Without frame step control, this is little bit hardwer since we need to stop at precise locations manually.

Why ist the feature relevant to this fork?

Nothing related to vanilla NewPipe. It's purely for sponsorblock purpose.

Additional information

No response