Provide a way to specify a command to obtain password for --password

[smktpd]

Purpose of the feature (why)

We have poor administrators and they've configured oidc server poorly, so it doesn't support the browser redirect to the localhost listener, so browser auth fails.
So what I am left with is specifying my password in CLI.
I don't want to hardcode my password in kubeconfig files and yet I don't want to write-in password every 30 minutes (we have multiple different clusters that I have to switch between and tokens don't live for long, so on average I have to type in my password every 30 minutes).

Your idea (how)

Add an arg like --password-command: its value should be treated as a command to execute and the output of that command should then be used as password.