Support new turbo module EventEmitter APIs with a new `REACT_EVENT_EMITTER` macro and matching spec codegen

[jonthysell]

Summary

The upstream RN codegen was updated to support a new kind of API for turbo modules called EventEmitters.

See: https://github.com/facebook/react-native/pull/44809/files#diff-b368b293fedfa28c87276b3c85052a3c717f1d99c05ae3a257ba0836131a2a40

We need to both create the macros that support these APIs and also update our codegen to generate the proper asserts in the spec to catch when they're not implemented.

Motivation

This is a new upstream feature that will be expected as of the 7/1 integrate (see #13508).

Basic Example

No response

Open Questions

No response