refactor!: remove unused playerStateStream (#1280)

Remove unused player state stream. See this comment.

BREAKING CHANGE: But it should not play a role:

stream was never called, so it never emitted any events, (except for web, which also already emits onComplete event). So most likely no-one did listen to this stream.
the according stream is further exposed in main audioplayers package, so it's not breaking the main package.

packages/audioplayers_platform_interface/lib/audioplayers_platform_interface.dart

@@ -4,7 +4,6 @@ import 'dart:typed_data';
 import 'package:audioplayers_platform_interface/api/audio_context_config.dart';
 import 'package:audioplayers_platform_interface/api/for_player.dart';
 import 'package:audioplayers_platform_interface/api/player_mode.dart';
-import 'package:audioplayers_platform_interface/api/player_state.dart';
 import 'package:audioplayers_platform_interface/api/release_mode.dart';
 import 'package:audioplayers_platform_interface/method_channel_audioplayers_platform.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
@@ -120,8 +119,6 @@ abstract class AudioplayersPlatform extends PlatformInterface {
   ///  * otherwise not supported (e.g. LOW_LATENCY mode on Android)
   Future<int?> getCurrentPosition(String playerId);
 
-  Stream<ForPlayer<PlayerState>> get playerStateStream;
-
   Stream<ForPlayer<Duration>> get positionStream;
 
   Stream<ForPlayer<Duration>> get durationStream;

packages/audioplayers_platform_interface/lib/streams_interface.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 
 import 'package:audioplayers_platform_interface/api/for_player.dart';
-import 'package:audioplayers_platform_interface/api/player_state.dart';
 import 'package:flutter/foundation.dart';
 
 mixin StreamsInterface {
@@ -13,10 +12,6 @@ mixin StreamsInterface {
     _completeStreamController.add(ForPlayer(playerId, null));
   }
 
-  void emitPlayerState(String playerId, PlayerState value) {
-    _playerStateStreamController.add(ForPlayer(playerId, value));
-  }
-
   void emitDuration(String playerId, Duration value) {
     _durationStreamController.add(ForPlayer(playerId, value));
   }
@@ -34,9 +29,6 @@ mixin StreamsInterface {
   Stream<ForPlayer<Duration>> get durationStream =>
       _durationStreamController.stream;
 
-  Stream<ForPlayer<PlayerState>> get playerStateStream =>
-      _playerStateStreamController.stream;
-
   Stream<ForPlayer<Duration>> get positionStream =>
       _positionStreamController.stream;
 
@@ -49,9 +41,6 @@ mixin StreamsInterface {
   final StreamController<ForPlayer<Duration>> _durationStreamController =
       StreamController<ForPlayer<Duration>>.broadcast();
 
-  final StreamController<ForPlayer<PlayerState>> _playerStateStreamController =
-      StreamController<ForPlayer<PlayerState>>.broadcast();
-
   final StreamController<ForPlayer<Duration>> _positionStreamController =
       StreamController<ForPlayer<Duration>>.broadcast();
 
@@ -60,7 +49,6 @@ mixin StreamsInterface {
     _seekCompleteStreamController.close();
     _completeStreamController.close();
     _durationStreamController.close();
-    _playerStateStreamController.close();
     _positionStreamController.close();
   }
 }

packages/audioplayers_web/lib/wrapped_player.dart

@@ -1,7 +1,6 @@
 import 'dart:async';
 import 'dart:html';
 
-import 'package:audioplayers_platform_interface/api/player_state.dart';
 import 'package:audioplayers_platform_interface/api/release_mode.dart';
 import 'package:audioplayers_platform_interface/streams_interface.dart';
 
@@ -80,7 +79,6 @@ class WrappedPlayer {
     playerEndedSubscription = p.onEnded.listen((_) {
       pausedAt = 0;
       player?.currentTime = 0;
-      streamsInterface.emitPlayerState(playerId, PlayerState.stopped);
       streamsInterface.emitComplete(playerId);
     });
   }