Playback speed

[bedeho]

Context

I often want to do this, in particular to see reviews, e.g. of know-your-council. Not urgent, just giving my feedback.

Scope

• Control playback speed
• Speed setting stored in local storage and applies to next video in playback [applies to all settings]

Designs

• Link to Figma user story

┆Issue is synchronized with this Asana task by Unito

[toiletgranny]

@dmtrjsg Does it make sense to have this issue moved under the "Subtitles" epic, since we agreed to include it in the scope, on the "since-we-are-here-kind-of-basis"?

[toiletgranny]

@dmtrjsg Designs for the playback speed controls have been transferred over to the Video page Figma file by @TCzechowski when working on #1503.

The flow for changing playback speed can be found here.