Add long press gesture to 2x speed in the separate video player

[Aga-C]

Checklist

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

Feature description

Continue work from: #666 - a long press gesture to temporary increase speed to 2x while playing a video.

Currently, it has been only done in the basic video player to not overcomplicate the implementation (see: #787).

Why do you want this feature?

Both players should have the same set of features (despite horizontal gestures).

Additional information

Adding a new long press gesture shouldn't override any existing gestures.