fix: change local video track constructor (#971)

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## Summary by CodeRabbit

* **Refactor**
* Updated the internal initialization structure of video track
components for improved code organization and maintainability.

Thir PR updates the LocalVideoTrack definition to carry an "@internal"
annotation and match the LocalAudioTrack version.

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settings.</sub>

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Author: italomiguelpinheiro

lib/src/track/local/video.dart

@@ -175,7 +175,8 @@ class LocalVideoTrack extends LocalTrack with VideoTrack {
   }
 
   // Private constructor
-  LocalVideoTrack._(
+  @internal
+  LocalVideoTrack(
     TrackSource source,
     rtc.MediaStream stream,
     rtc.MediaStreamTrack track,
@@ -189,7 +190,7 @@ class LocalVideoTrack extends LocalTrack with VideoTrack {
     options ??= const CameraCaptureOptions();
 
     final stream = await LocalTrack.createStream(options);
-    final track = LocalVideoTrack._(
+    final track = LocalVideoTrack(
       TrackSource.camera,
       stream,
       stream.getVideoTracks().first,
@@ -218,7 +219,7 @@ class LocalVideoTrack extends LocalTrack with VideoTrack {
     options ??= const ScreenShareCaptureOptions();
 
     final stream = await LocalTrack.createStream(options);
-    return LocalVideoTrack._(
+    return LocalVideoTrack(
       TrackSource.screenShareVideo,
       stream,
       stream.getVideoTracks().first,
@@ -247,7 +248,7 @@ class LocalVideoTrack extends LocalTrack with VideoTrack {
     final stream = await LocalTrack.createStream(options);
 
     final List<LocalTrack> tracks = [
-      LocalVideoTrack._(
+      LocalVideoTrack(
         TrackSource.screenShareVideo,
         stream,
         stream.getVideoTracks().first,