Add support for TurboModule

[tido64]

Following the flag to enable Fabric (#785), we should also add a flag to enable TurboModules:

• Enable TurboModule on Android
• Enable TurboModule on iOS
• Hook up autolinking

Blocked by

• Autolinking support on Android: TurboModule Deep Dive reactwg/react-native-new-architecture#2 (reply in thread) Implemented in feat: autolinking for the new architecture on Android react-native-community/cli#1603