feat(android): stream the connection info

lib/src/platforms/android/nearby_android_service.dart

@@ -126,6 +126,14 @@ class NearbyAndroidService extends NearbyService {
     return NearbyServiceAndroidPlatform.instance.getConnectionInfo();
   }
 
+  ///
+  /// Streams [NearbyConnectionAndroidInfo] -
+  /// information about the connection information.
+  ///
+  Stream<NearbyConnectionAndroidInfo?> getConnectionInfoStream() {
+    return NearbyServiceAndroidPlatform.instance.getConnectionInfoStream();
+  }
+
   void _requireAndroidDevice(NearbyDevice device) {
     assert(
       device is NearbyAndroidDevice,

lib/src/platforms/android/nearby_service_android_interface.dart

@@ -54,4 +54,10 @@ abstract class NearbyServiceAndroidPlatform extends PlatformInterface {
   Future<bool> disconnect(String deviceAddress) {
     throw UnimplementedError('disconnect() has not been implemented.');
   }
+
+  Stream<NearbyConnectionAndroidInfo?> getConnectionInfoStream() {
+    throw UnimplementedError(
+      'getConnectionInfoStream() has not been implemented.',
+    );
+  }
 }

lib/src/platforms/android/nearby_service_android_method_channel.dart

@@ -64,4 +64,14 @@ class MethodChannelAndroidNearbyService extends NearbyServiceAndroidPlatform {
         )) ??
         false;
   }
+
+  @override
+  Stream<NearbyConnectionAndroidInfo?> getConnectionInfoStream() {
+    const connectedDeviceChannel = EventChannel(
+      "nearby_service_connection_info",
+    );
+    return connectedDeviceChannel.receiveBroadcastStream().map(
+          (e) => NearbyConnectionInfoMapper.mapToInfo(e),
+        );
+  }
 }

lib/src/utils/file_socket.dart

@@ -31,8 +31,8 @@ class FilesSocket {
   final NearbyMessageFilesContent content;
   final void Function(String) onDestroy;
   final NearbyServiceFilesListener? listener;
-
   final WebSocket _socket;
+
   final _files = <NearbyFile>[];
   final _bytesTable = <String, List<int>>{'0': []};
   final _futures = <Future>[];