[Feature Request] membershipInfo in operator cluster describe

[dnr]

Is your feature request related to a problem? Please describe.

tctl had a command tctl admin cluster describe that included a membershipInfo field with useful info for debugging ringpop/membership stuff. cli has temporal operator cluster describe -o json with most of the same fields but it's missing membershipInfo.

Describe the solution you'd like

Add membershipInfo back to temporal operator cluster describe output, or make a new subcommand for it.