initialize method
initialize the flutter sdk
Implementation
Future<void> initialize() async {
if (isInitialized) return;
final flutterRoot = await _getFlutterRootDirectory();
final flutterDirectory = LocalFileSystem()..currentDirectory = flutterRoot;
Cache.flutterRoot = Cache.defaultFlutterRoot(
platform: const LocalPlatform(),
fileSystem: flutterDirectory,
userMessages: UserMessages(),
);
}