tls: make tls.connect() accept a timeout option

If specified, and only when a socket is created internally, the option
will make `socket.setTimeout()` to be called on the created socket with
the given timeout.

This is consistent with the `timeout` option of `net.connect()` and
prevents the `timeout` option of the `https.Agent` from being ignored
when a socket is created.

PR-URL: https://github.com/nodejs/node/pull/25517


Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>