[Feature request] Provide option to set default video playback rate

[abhineetgupta]

Is your feature request related to a problem? Please describe.
For videos, it would be really nice to be able to set a default playback rate.

Describe the solution you'd like
An option in “General Settings” to set the default playback rate of videos, if supported.

Describe alternatives you've considered
Currently, only way to achieve this on iOS is to open the post, which then shows the video controls where the playback speed can be changed manually.

Additional context
It looks like Apple may provide the defaultPlaybackRate property to be set at an app level.
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