[core] Introduce a NativeModule class in JS

[tsapeta]

Why

Native modules should also be event emitters, so we need to make them something more than just raw objects.

How

Introduces NativeModule class in JS on iOS and Android that inherits from EventEmitter. Native modules are instances of that class (except the core module!).

Test Plan

Tested in bare-expo on both iOS and Android and checked that module objects contain EventEmitter methods (which was the main goal)

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: a05bfbc

Fingerprint diff

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  {
    "type": "dir",
    "filePath": "../../packages/expo-modules-core/android",
    "reasons": [
      "expoAutolinkingAndroid"
    ],
    "hash": "3aba41c82a7addef79279dc5e1d8320e19c5f335"
  }
]

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