feat: adds variable playbackrate in settings

[AndreCI]

• Adds an option in data.json to play at various playrate (could be an option directly in obsidian)
• Adds an option in data.json to start live videos at zero, so that it can play at an increased playbackrate (could be an option directly in obsidian)
• Adds 500ms delay onSoundscapeChange (let the player load info before using seekTo() and setPlayBackRate())

Motivation: I enjoy listening to LoFi at x1.25 :)

[andrewmcgivery]

Hey @AndreCI :)

Appreciate you taking the time to open this PR. 😃

I just released a pretty big update of this plugin that would render your PR unmergeable at this point, so you'll likely need to go back to the drawing board.

Other feedback I'd have before I could consider this contribution:

• There should be nothing stored in settings without a physical UI in the settings screen
• setTimeout should generally be avoided in the way you're using it as it created an unnecessary race condition

Happy to consider this on a new PR against the up-to-date code base and those feedback items addressed or you can open an issue and I may get to it at some point but in either case, closing this PR for now.