Support "bridgeless" mode by exposing a TurboModule on iOS

[kraenhansen]

Historically our library has always been bridgeless, in the sense that we never really used the bridge to communicate from JS and instead relied on internal APIs to get a pointer to the JS runtime and expose our C++ library code through JS by constructing JS objects and functions via JSC and later JSI calls.

We did migrate the way we load our native code on Android to use a TurboModule, but the mechanism we use to initialize our native binding on iOS is still a hack and rely on the bridge. Since React Native 0.74.0 enables bridgeless by default when the new architecture is enabled, this refactor is overdue.

Relevant documentation:

• Cross-Platform Turbo Native Modules with C++
• Supporting Custom C++ Types

[sync-by-unito]

➤ PM Bot commented:

Jira ticket: RJS-2815