Add support for the New Architecture

[lindboe]

In scope:

1. Define a spec for the module in TypeScript that can be used with codegen and consume this in a backwards-compatible Turbo Module.
2. Test the Turbo Module in a non-New Architecture app to ensure backwards compatibility.
3. Test the Turbo Module in a New Architecture app.

References:

Note: some resources, particularly the examples, could be out-of-date. Questions should be directed to https://github.com/reactwg/react-native-new-architecture.

1. Creating a new Turbo Module, official guide
2. Migrating your library to the New Architecture, Javascript, iOS, and Android
3. Creating a Turbo Module with Swift code, example
4. Creating a backwards-compatible Turbo Module, guide, example

Out of scope:

• Bridgeless mode. It's just released and still (even more) experimental than the previous New Architecture support.