Version 0.13.1

Python 3.9.11 on Debian testing.

I saw #567 , but this is still broken.

prometheus_client.start_http_server(port=9888, addr="localhost") - only listens on IPv4

prometheus_client.start_http_server(port=9888, addr="::") - doesn't work

prometheus_client.start_http_server(port=9888, addr="::1") - doesn't work

prometheus_client.start_http_server(port=9888, addr="[::]") - doesn't work

Optimally, it should be configurable using a single parameter, because it is easier to pass things from command line using a single parameter, than parsing it manually in every program that requires it:

--listen=:9888 for example, to listen on 0.0.0.0 and ::.
--listen=localhost:9888 for example, to listen on 127.0.0.1 and ::1.
--listen=[::1]:9888 for example, to listen on ::1.
--listen=127.0.0.1:9888 for example, to listen on 127.0.0.1.

Ability to bind to interface would also be nice. (i.e. --listen=10.0.0.1:9888@eth1)