feat(Prime Video): Change video playback speed

[therealsuji]

Feature description

A patch for amazon prime that allows you to set the playback speed like in netflix, youtube etc

Motivation

Most streaming apps like YouTube and Netflix lets you change playback speed, but Prime Video doesn’t have that on mobile. It’s a super handy feature for binge-watching or getting through slower content faster.

Acknowledgements

• I have checked all open and closed feature requests and this is not a duplicate
• I have chosen an appropriate title.
• All requested information has been provided properly.

[malaguer]

It works great. Thanks a lot for the contribution. The app is now even better than the original!