Add support for /status/runtimeinfo endpoint to the api client

[lilic]

Seems like there is status/config and status/flags but not status/runtimeinfo, any particular reason why this endpoint is missing or just simply was not added yet?
(Happy to add it, if it's the latter)

client_golang/api/prometheus/v1/api.go

Lines 138 to 139 in 6edbbd9

	epConfig = apiPrefix + "/status/config"
	epFlags = apiPrefix + "/status/flags"

[bwplotka]

It's a new endpoint, that's it (:

[bwplotka]

If I am not wrong, help wanted to add it 🤗

[beorn7]

Yup. Potentially even very easy, if the structure is similar to the existing endpoints.

[lilic]

As mentioned in the issue happy to do this, just wanted to confirm this is welcome.