Adding Node-API support to Static Hermes

There is an existing PR to add Node-API to Hermes (https://github.com/facebook/hermes/pull/1377). In order to add support Static Hermes, we need to do a few things in addition to what is currently done in the PR:

1. Pull the latest version of the Node-API implementation from https://github.com/microsoft/hermes-windows
2. Add the tests for the Node-API implementation from that repo
3. Put the implementation in a separate directory in the `API` directory
4. Add a separate CMake target for the Node-API implementation

Start by comparing the existing Node-API work in PR 1377 with the implementation and tests in microsoft/hermes-windows. Inspect the API directory and CMake configuration to determine the separate implementation location and target. Done means the updated implementation and tests are included and the separate CMake target builds successfully.

Written by the indexing model from the issue text.