meta: add N-API to codeowners coverage

We have this guidance for contributing to N-API:
https://github.com/nodejs/node/blob/master/doc/guides/adding-new-napi-api.md



It makes sense to have one of the N-API team sign off on commits
that changes N-API

Signed-off-by: Michael Dawson <michael_dawson@ca.ibm.com>

PR-URL: https://github.com/nodejs/node/pull/34039


Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>