http: expose headers on an http.ClientRequest "information" event

1xx intermediate status responses are allowed to have headers; so
expose the "httpVersion", "httpVersionMajor", "httpVersionMinor",
"headers", "rawHeaders", and "statusMessage" properties on this
event.

PR-URL: https://github.com/nodejs/node/pull/28459


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