Add android take snapshot feature

[chinloongtan]

#358

Take snapshot of remote participant video for Android.
For iOS, use react-native-view-shot.

---

A few changes I made that might not make it to the master branch.
I created this PR as a reference for anyone in the future who might need this feature.

1. PatchedVideoView now extends VideoTextureView, previously VideoView.
2. Comment out this.getSurfaceViewRenderer().applyZOrder(true); as VideoTextureView don't have that method.

captureBitmapFromYuvFrame doesn't freeze video like getBitmap does (noticeably longer). So I am keeping the implementation since it's working.

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takeSnapshot intercepts renderFrame and convert the frame to bitmap, then to temp image file.
It takes snapshot of 1 participant view. (For multiple views in 1 image, you might want to think about other way to do it.)

Usage:

              <TwilioVideoParticipantView
                ref={(ref) => {
                  this.remoteView = ref;
                }}
                onSnapshot={this.onSnapshot}
                ...
              />

this.remoteView.takeSnapshot(); // put this in button `onPress`

  onSnapshot(event = {}) {
    if (event.error) {
      console.log('onSnapshot error', event.error);
      return;
    }

    console.log('Screenshot added', event.uri);
  }

Sample uri
/data/user/0/com.xxx/cache/snapshot_video3186517848496583071.png

[slycoder]

Awesome, looks great! Just one minor comment below before merging.

[slycoder]

I agree that it's problematic that we apply this to each view but would you mine leaving this line as is for now? I wanna try a more comprehensive approach to this going forward.

[chinloongtan]

Got it, will figure that out. Cause I did it to comply with extending PatchedVideoView from VideoTextureView

[Andriiklymiuk]

what the status of this one?