Summary:
Moved the JS wrapper function to github. To access a TurboModule from JS:
```
export interface Spec extends TurboModule {
+func1: () => number,
}
const module = TurboModuleRegistry.get<Spec>('SampleTurboModule');
```
This assumes:
* the binding on the native side has been installed properly, i.e. `global.__turboModuleProxy` needs to be installed properly.
* the module `SampleTurboModule` is registered properly in native.
More instructions will be provided later.
Reviewed By: yungsters
Differential Revision: D13584561
fbshipit-source-id: 50d29d88787f8d9caa7a3ee0d54d378db866515c
