///Class that implements a singleton object (shared instance) which manages the shared HTTP auth credentials cache.
///On iOS, this class uses the [URLCredentialStorage](https://developer.apple.com/documentation/foundation/urlcredentialstorage) class.
///On Android, this class has a custom implementation using `android.database.sqlite.SQLiteDatabase` because [WebViewDatabase](https://developer.android.com/reference/android/webkit/WebViewDatabase)
///On Android, this class has a custom implementation using `android.database.sqlite.SQLiteDatabase` because