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: #34039
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

.github/CODEOWNERS

@@ -74,3 +74,10 @@
 # ./lib/internal/modules/* @nodejs/modules
 # ./lib/internal/bootstrap/loaders.js @nodejs/modules
 # ./src/module_wrap* @nodejs/modules @nodejs/vm
+
+# N-API
+
+# /src/node_api* @nodejs/n-api
+# /src/js_native_api* @nodejs/n-api
+# /doc/guides/adding-new-napi-api.md @nodejs/n-api
+# /doc/api/n-api.md @nodejs/n-api