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/ReactPackageProvider.h

@@ -1,20 +1,13 @@
-#pragma once
-
-#include "winrt/Microsoft.ReactNative.h"
-
-
-
-using namespace winrt::Microsoft::ReactNative;
-
-namespace winrt::VideoPlayer::implementation
-{
-
-    struct ReactPackageProvider : winrt::implements<ReactPackageProvider, IReactPackageProvider>
-    {
-    public: // IReactPackageProvider
-        void CreatePackage(IReactPackageBuilder const &packageBuilder) noexcept;
-    };
-
-} // namespace winrt::VideoPlayer::implementation
-
-
+#pragma once
+
+#include "winrt/Microsoft.ReactNative.h"
+
+namespace winrt::videoplayer::implementation
+{
+    struct ReactPackageProvider : winrt::implements<ReactPackageProvider, winrt::Microsoft::ReactNative::IReactPackageProvider>
+    {
+    public: // IReactPackageProvider
+        void CreatePackage(winrt::Microsoft::ReactNative::IReactPackageBuilder const &packageBuilder) noexcept;
+    };
+} // namespace winrt::videoplayer::implementation
+