[fix][macos][fabric] Add correct source prop for macOS new arch support

[shwanton]

Context

• RN MacOS can be built w/ the new Arch
  • cd example/macos && RCT_NEW_ARCH_ENABLED=1 pod install
• RN Webview was not working on MacOS since we were not passing the correct newSource={newSource} prop that the Fabric component requires. https://github.com/react-native-webview/react-native-webview/blob/7420ed8e02291a7749d34c6f2c95b1a077319545/src/RNCWebViewNativeComponent.ts#L279
• implementation copied from ios: https://github.com/react-native-webview/react-native-webview/blob/7420ed8e02291a7749d34c6f2c95b1a077319545/src/WebView.ios.tsx#L267

Change

• Use iOS new arch api for macOS

Fabric

https://github.com/react-native-webview/react-native-webview/assets/96719/869e39db-4f26-45d0-a963-4287f1cca156

Paper

[react-native-community-bot]

:tada: This PR is included in version 13.9.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: