benchmark: add simple https benchmark

Adds a simple benchmark for https server based on the http simple
benchmark. Updates benchmarker integration for autocannon and wrk,
so that they support https scheme.

Also adds a new HTTPS section and improves HTTP/2 section in
the benchmark guide.

PR-URL: https://github.com/nodejs/node/pull/36612


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>