src: simplify handles for libuv streams

Instead of passing along the handle object, just set it as a
property on the stream handle object and let the read handler
grab it from there.

PR-URL: https://github.com/nodejs/node/pull/18334


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>