* fix: fix crash when invalid index type is provided and minor clean up
* fix: review video track management. Fix index support and rework string vs int in tracks management
* fix: ABR track selection check
* fix: split track selector in sample and lint code
* fix: ensure we don't report null fields
* chore: improve tracks displayed
* chore: start moving to selection by index only
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
