Re-export types from expo-modules-core in expo package

[tsapeta]

Why

expo package should re-export some common and stable APIs from expo-modules-core that we would like to show in the docs.

How

This PR re-exports EventEmitter, SharedObject and NativeModule classes from expo-modules-core.

Additionally, I'm introducing expo/types import which exports these three classes but as types instead of values. They have the same names, so exporting them from the main entry point is a bit tricky. Docs data generation also needs these types to be exposed.

Test Plan

• SDK checks are passing
• Docs are looking good enough (except that EventEmitter methods are unnecessarily listed in its subclasses)

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: 8f4d915

Fingerprint diff

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[expo-bot]

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