fix(ios, macos): Suspend media playback when destroying WebView on iO…

…S/macOS (react-native-webview#3234)

* Suspend media playback when destroying WebView on iOS/macOS

* Fixes crash on iOS <15.0 and macOS <12.0 when pausing playback on dismount

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Co-authored-by: Thibault Malbranche <thibault@brigad.co>

apple/RNCWebViewImpl.m

@@ -569,6 +569,11 @@ - (void)removeFromSuperview
     [_webView.configuration.userContentController removeScriptMessageHandlerForName:MessageHandlerName];
     [_webView removeObserver:self forKeyPath:@"estimatedProgress"];
     [_webView removeFromSuperview];
+    if (@available(iOS 15.0, macOS 12.0, *)) {
+        [_webView pauseAllMediaPlaybackWithCompletionHandler:nil];
+    } else if (@available(iOS 14.5, macOS 11.3, *)) {
+        [_webView suspendAllMediaPlayback:nil];
+    }
 #if !TARGET_OS_OSX
     _webView.scrollView.delegate = nil;
     if (_menuItems) {