Support for Force Feedback/Haptics/Rumble on controllers in iOS

[jet082]

Is your feature request related to a problem? Please describe.
In the past, force feedback on connected controllers was unsupported on iOS (as noted in #379). However, as of iOS 14 this is no longer the case.

Describe the solution you'd like
Force Feedback is now an option, so it would be nice to have it.

Describe alternatives you've considered
You could always plug your controller into the PC directly and then use a really, really, really long controller...

Additional context
There is a sample of bluetooth haptics on iOS here - https://developer.apple.com/documentation/corehaptics/playing_haptics_on_game_controllers

There is a talk on this topic here - https://developer.apple.com/videos/play/wwdc2020/10614/

A list of games that use this - https://www.reddit.com/r/iosgaming/comments/swzbmz/detailed_post_review_for_ipad/

This is also tangentially related to #445.

[jet082]

Nevermind! Apparently, this works just fine... It just wasn't working for a few of the games I tried before making this issue. I wonder why... I suspect it is because I had a controller plugged into the PC. In a setting like Duckstation, wherein I could set the rumble device directly, it worked just fine.