src: expose uv.errmap to binding

Add a errno -> [error code, uv error message] map to the uv binding
so the error message can be assembled in the JS layer.

Backport-PR-URL: https://github.com/nodejs/node/pull/19191
PR-URL: https://github.com/nodejs/node/pull/17338


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>