security vulnerability fix - add new cmdline flags to disable/change …

[123456890987654321]

…route for pprof debug endpoints

[discordianfish]

If we want to support this, it should go into https://github.com/prometheus/exporter-toolkit but first discuss in our community channels. Since we decided against in this in the past, see #2860, https://github.com/prometheus/node_exporter/issues/2397, https://github.com/prometheus/node_exporter/issues/1911