all logging out of all contexts in a single command, or at least listing contexts in machine readable format

[adrian-gierakowski]

Summary

I would like to be able to easily logout from all contexts, for example with:

argocd logut --all

or at least be able to list contexts in format easy to iterate in a script

Motivation

I use multiple context during a workday, and would like to log-out from all of them at the end of the day

Proposal

option 1:

add --all flag to logout

options 1:

add some flag to context command to print just the contexts, one per line, or as json array