Allow controlling playback speed in video player.

[M7amma]

Checklist

• [X] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [X] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [X] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [X] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.
• [X] I optionally donated to support the Fossify mission.

Feature description

Just a small feature but very needed , allow controlling the video playback speed from within the player ui through a toolbar button or drop down menu with changeable speed presets

Why do you want this feature?

It's important.

Additional information

No response

[Aga-C]

It's a duplicate of https://github.com/FossifyOrg/Gallery/issues/116.