iOS Swift Conversion (#2527)

Converts iOS implementation from Objective-c to Swift

# During the conversion process some updates to the code structure were also made
- Modularize codebase from single file to smaller focused files
- Untangled large nested IF statements
- Added more null checks, since Swift is more strict with null pointers
- Added property to allow for decoding of local video sources with self contained key for offline playback
- Updates example apps to test react-native 0.63.4 and uses auto native dependency imports for android and ios

examples/basic/windows/VideoPlayer/pch.h

@@ -1,28 +1,26 @@
-#pragma once
-
-#define NOMINMAX
-
-#include <hstring.h>
-#include <restrictederrorinfo.h>
-#include <unknwn.h>
-#include <windows.h>
-#include <winrt/Windows.ApplicationModel.Activation.h>
-#include <winrt/Windows.Foundation.Collections.h>
-#include <winrt/Windows.Foundation.h>
-#include <winrt/Windows.UI.Xaml.Controls.Primitives.h>
-#include <winrt/Windows.UI.Xaml.Controls.h>
-#include <winrt/Windows.UI.Xaml.Data.h>
-#include <winrt/Windows.UI.Xaml.Interop.h>
-#include <winrt/Windows.UI.Xaml.Markup.h>
-#include <winrt/Windows.UI.Xaml.Navigation.h>
-#include <winrt/Windows.UI.Xaml.h>
-
-#include <winrt/Microsoft.ReactNative.h>
-
-#include <winrt/Microsoft.UI.Xaml.Automation.Peers.h>
-#include <winrt/Microsoft.UI.Xaml.Controls.Primitives.h>
-#include <winrt/Microsoft.UI.Xaml.Controls.h>
-#include <winrt/Microsoft.UI.Xaml.Media.h>
-#include <winrt/Microsoft.UI.Xaml.XamlTypeInfo.h>
-
-#include "nativeModules.g.h"
+#pragma once
+
+#define NOMINMAX
+
+#include <hstring.h>
+#include <restrictederrorinfo.h>
+#include <unknwn.h>
+#include <windows.h>
+#include <winrt/Windows.ApplicationModel.Activation.h>
+#include <winrt/Windows.Foundation.Collections.h>
+#include <winrt/Windows.Foundation.h>
+#include <winrt/Windows.UI.Xaml.Controls.Primitives.h>
+#include <winrt/Windows.UI.Xaml.Controls.h>
+#include <winrt/Windows.UI.Xaml.Data.h>
+#include <winrt/Windows.UI.Xaml.Interop.h>
+#include <winrt/Windows.UI.Xaml.Markup.h>
+#include <winrt/Windows.UI.Xaml.Navigation.h>
+#include <winrt/Windows.UI.Xaml.h>
+
+#include <winrt/Microsoft.ReactNative.h>
+
+#include <winrt/Microsoft.UI.Xaml.Automation.Peers.h>
+#include <winrt/Microsoft.UI.Xaml.Controls.Primitives.h>
+#include <winrt/Microsoft.UI.Xaml.Controls.h>
+#include <winrt/Microsoft.UI.Xaml.Media.h>
+#include <winrt/Microsoft.UI.Xaml.XamlTypeInfo.h>