This PR is for enabling fps and bitrate control of recorded video.
Allow users to more control over recorded video size.
`CameraPlatform.createCameraWithSettings` is added, leaving original `CameraPlatform.createCamera` commented as deprecated. So this is not breaking change.
Tested on a set of mobile devices.
Web support depends on browser (perfect with Firefox).

Fixes https://github.com/flutter/flutter/issues/54339