fix(ios): fix playback status with lifecycle

[YangJonghun]

Summary

fix(ios): fix playback status with lifecycle

Motivation

• Modify it to ignore playInBackground because people can use AppleTV, airplay, etc.

Changes

• check external playback active state with iOS lifecycle

• check playback status via "_isPlaying" instead of "_paused"

  • "_paused" is not exactly synchronized with the player's current state. this change is important because the introduction of the "showNotificationControls" prop makes it possible for external controls to control the video.

• resolve [Feature]: detect airplay(or mirroring) playback within iOS native side #3790

Memo

Since the "showNotificationControls" prop allows people to control the video with external controls, I think we need to clarify the behavior of props like playInBackground, playWhenInactive. Currently, we can only control the entry point of lifecycle, and it can be played at any time while not in the foreground.

[freeboub]

fully agree with your memo ...

[freeboub]

@YangJonghun will it also fix #3770 ?

[YangJonghun]

@freeboub
I don't think so, that issue is about audio control. this PR simply changes state of the player.

[KrzysztofMoch]

@YangJonghun After this change when we set playInBackground to true when app going background, playback is pausing even if there is no external playback active

[YangJonghun]

@KrzysztofMoch
I'll check it out. Thanks for letting me know:)

[YangJonghun]

@KrzysztofMoch
The modified code works as intended, and the issue is reproduced in commits before this PR was merged.
FYI) Commit before this PR was merged - https://github.com/TheWidlarzGroup/react-native-video#d072aeb451f515b84b821367bfa3c12cfbeeb725
Probably other code is the cause.