fix(iOS): sometimes aspect ratio is invalid (#3821)

* perf: ensure we do not provide callback to native if no callback provided from app

* chore: rework bufferConfig to make it more generic and reduce ReactExoplayerView code size

* chore: improve issue template

* fix(android): avoid video view flickering at playback startup

* fix: invert aspect ratio evaluation to find video height / width

ios/Video/RCTVideo.swift

@@ -1383,12 +1383,14 @@ class RCTVideo: UIView, RCTVideoPlayerViewControllerDelegate, RCTPlayerObserverH
                 var orientation = "undefined"
 
                 let tracks = await RCTVideoAssetsUtils.getTracks(asset: _playerItem.asset, withMediaType: .video)
-                if let videoTrack = tracks?.first {
-                    width = Float(videoTrack.naturalSize.width)
-                    height = Float(videoTrack.naturalSize.height)
-                } else if _playerItem.presentationSize.height != 0.0 {
-                    width = Float(_playerItem.presentationSize.width)
-                    height = Float(_playerItem.presentationSize.height)
+                var presentationSize = _playerItem.presentationSize
+                if presentationSize.height != 0.0 {
+                    width = Float(presentationSize.width)
+                    height = Float(presentationSize.height)
+                } else if let videoTrack = tracks?.first {
+                    let naturalSize = videoTrack.naturalSize
+                    width = Float(naturalSize.width)
+                    height = Float(naturalSize.height)
                 }
                 orientation = width > height ? "landscape" : width == height ? "square" : "portrait"