Better audio management (#10)

* add audio_session package

* `AudioManager` initial design

* try to integrate audio manager

* configure audio session

* `DisposeAware`

disposing if already published causes exception.

* organize

* guard flutter_webrtc calls

* websocket async fix

* use `ConnectionState` instead of `_isClosed` and `isReconnecting`

* change create audio track defaults

* update protos

* protocol 3 speaker updates

* fix exception

* emit `RoomDisconnectedEvent` only once

* fix exception

* keep track of local / remote audio tracks

* explicit types

* manage track state

* re-structure audio management

* change defaults

* unpublish all

* use experimental build

* change defaults

* configuring is optional

* call native `RTCAudioSession.setConfiguration`

* defaults adjustment

* iOS only for now

* use lib 92.4515.07

* clean up

* revert audio options for now

* remove pod source

* rename apple related audio

* `createListener` method

* organize native audio

* `SpeakingChangedEvent` only on `Participant`

* refactoring

* fix ios compile

* fix configure audio only for iOS logic

* minor fix & clean up

* change dispose logic

* format protos

* fix unpublishTrack

* `createListener` into a mixin

* simplify

* use flutter_webrtc master

* unpublish for example

* update ios icon

* android icon

* web icon

* favicon

lib/src/proto/livekit_models.pbjson.dart

@@ -40,12 +40,13 @@ const Room$json = const {
       '6': '.livekit.Codec',
       '10': 'enabledCodecs'
     },
+    const {'1': 'metadata', '3': 8, '4': 1, '5': 9, '10': 'metadata'},
   ],
 };
 
 /// Descriptor for `Room`. Decode as a `google.protobuf.DescriptorProto`.
 final $typed_data.Uint8List roomDescriptor = $convert.base64Decode(
-    'CgRSb29tEhAKA3NpZBgBIAEoCVIDc2lkEhIKBG5hbWUYAiABKAlSBG5hbWUSIwoNZW1wdHlfdGltZW91dBgDIAEoDVIMZW1wdHlUaW1lb3V0EikKEG1heF9wYXJ0aWNpcGFudHMYBCABKA1SD21heFBhcnRpY2lwYW50cxIjCg1jcmVhdGlvbl90aW1lGAUgASgDUgxjcmVhdGlvblRpbWUSIwoNdHVybl9wYXNzd29yZBgGIAEoCVIMdHVyblBhc3N3b3JkEjUKDmVuYWJsZWRfY29kZWNzGAcgAygLMg4ubGl2ZWtpdC5Db2RlY1INZW5hYmxlZENvZGVjcw==');
+    'CgRSb29tEhAKA3NpZBgBIAEoCVIDc2lkEhIKBG5hbWUYAiABKAlSBG5hbWUSIwoNZW1wdHlfdGltZW91dBgDIAEoDVIMZW1wdHlUaW1lb3V0EikKEG1heF9wYXJ0aWNpcGFudHMYBCABKA1SD21heFBhcnRpY2lwYW50cxIjCg1jcmVhdGlvbl90aW1lGAUgASgDUgxjcmVhdGlvblRpbWUSIwoNdHVybl9wYXNzd29yZBgGIAEoCVIMdHVyblBhc3N3b3JkEjUKDmVuYWJsZWRfY29kZWNzGAcgAygLMg4ubGl2ZWtpdC5Db2RlY1INZW5hYmxlZENvZGVjcxIaCghtZXRhZGF0YRgIIAEoCVIIbWV0YWRhdGE=');
 @$core.Deprecated('Use codecDescriptor instead')
 const Codec$json = const {
   '1': 'Codec',
@@ -182,3 +183,17 @@ const UserPacket$json = const {
 /// Descriptor for `UserPacket`. Decode as a `google.protobuf.DescriptorProto`.
 final $typed_data.Uint8List userPacketDescriptor = $convert.base64Decode(
     'CgpVc2VyUGFja2V0EicKD3BhcnRpY2lwYW50X3NpZBgBIAEoCVIOcGFydGljaXBhbnRTaWQSGAoHcGF5bG9hZBgCIAEoDFIHcGF5bG9hZBIpChBkZXN0aW5hdGlvbl9zaWRzGAMgAygJUg9kZXN0aW5hdGlvblNpZHM=');
+@$core.Deprecated('Use recordingResultDescriptor instead')
+const RecordingResult$json = const {
+  '1': 'RecordingResult',
+  '2': const [
+    const {'1': 'id', '3': 1, '4': 1, '5': 9, '10': 'id'},
+    const {'1': 'error', '3': 2, '4': 1, '5': 9, '10': 'error'},
+    const {'1': 'duration', '3': 3, '4': 1, '5': 3, '10': 'duration'},
+    const {'1': 'location', '3': 4, '4': 1, '5': 9, '10': 'location'},
+  ],
+};
+
+/// Descriptor for `RecordingResult`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List recordingResultDescriptor = $convert.base64Decode(
+    'Cg9SZWNvcmRpbmdSZXN1bHQSDgoCaWQYASABKAlSAmlkEhQKBWVycm9yGAIgASgJUgVlcnJvchIaCghkdXJhdGlvbhgDIAEoA1IIZHVyYXRpb24SGgoIbG9jYXRpb24YBCABKAlSCGxvY2F0aW9u');