* fix(ts): onPlaybackRateChangeData was not correctly typed
* fix: ensure tracks are well displayed in the sample
* fix(ios): text tracks selection by index. regression due to codegen rework
* chore: make selection by index testable (need a small manual patch)
* chore(ios): fix linter warning
Converts iOS implementation from Objective-c to Swift
# During the conversion process some updates to the code structure were also made
- Modularize codebase from single file to smaller focused files
- Untangled large nested IF statements
- Added more null checks, since Swift is more strict with null pointers
- Added property to allow for decoding of local video sources with self contained key for offline playback
- Updates example apps to test react-native 0.63.4 and uses auto native dependency imports for android and ios
