[Feature Request]: Add other player buttons to Picture-in-Picture mode

[SoykaffAddict]

Guidelines

• I have searched the issue tracker for open and closed issues that are similar to the feature request I want to file, without success.
• I have searched the documentation for information that matches the description of the feature request I want to file, without success.
• This issue contains only one feature request.

Problem Description

When using Picture in Picture mode only a play/stop button is available in the mini-player, this limits it's usefulness because
when you are following a video you have to go back to Freetube window and rewind x seconds.

Proposed Solution

Add rewind/forward x seconds buttons to the miniplayer, previous and next video too.

Alternatives Considered

Keyboard shortcuts that work when not focusing on the miniplayer window would also work.

Issue Labels

ease of use improvement, new feature, new keyboard shortcut

Additional Information

I did an edit on Krita to show how it can look

[absidue]

Duplicate of #5308