fix(ios): call PictureInPicture callbacks with native controls

[gkueny]

Summary

When we enter PiP from native controls, onPictureInPictureStatusChanged is never called.
When we exit PiP after enter from native controls, onPictureInPictureStatusChanged & onRestoreUserInterfaceForPictureInPictureStop are never called.

Should fix #3602

Motivation

Be notified when PictureInPicture status changed no matter how you enter this mode.
Has onRestoreUserInterfaceForPictureInPictureStop callback fire no matter how you exit PiP mode.

Changes

We add RCTPlayerObserver as playerViewController delegate to be notified with PiP lifecycle

Test plan

• Install https://github.com/gkueny/NativeControlsPiPCallback
• Reproduce the issue
• Install patch

yarn add react-native-video@https://github.com/gkueny/react-native-video.git#72ba955c464dc15a3db935de6fe8542c2b3cc0d3

• Validate that onPictureInPictureStatusChanged is called if you enter PiP mode from native controls
• Validate that onPictureInPictureStatusChanged is called if you exit PiP mode after enter it from native controls
• Validate that onRestoreUserInterfaceForPictureInPictureStop is called if you exit PiP mode after enter it from native controls

[gkueny]

I will test this change in our project. I will adjust this PR if needed after that

[gkueny]

@freeboub @KrzysztofMoch let me know if this bug fix seems ok for you.
On our side, this has been integrated into our app and corrects the issue raised with success.

[KrzysztofMoch]

Thanks, LGTM 🙌