[DRAFT] Add Node-API to Hermes

[vmoroz]

Summary

This is an initial implementation of Node-API for Hermes.
The code is taken from the hermes-windows repo.

Node-API is an ABI-safe that is originally implemented for Node.js addons, and then adopted by all major JS runtimes.

This is a draft PR. Before removing the draft status I would like to ask a few questons:

• What must be the library that exposes the Node-API? In hermes-windows we expose it for the hermes.dll. It is the libhermes for Windows. In this repo libhermes is not a shared library.
• Please advise on the source file names and their locations.
• What must be file headers?
• I am going to add the test files after figuring out what must be the library that exposes Node-API.

Test Plan

Unit tests for Node-API are to be added.

[tmikov]

Thanks for doing this @vmoroz!!!

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[shirakaba]

Thanks so much, @vmoroz! Really excited to play with this.

[NathanWalker]

Huge effort @vmoroz thank you ❤️