Add remove-members helper script

[mrbobbytables]

This was originally opened in PR #2048 where it was desired that this script be replaced with a go version. Issue #2052 was created with that purpose, but hasn't been moved on yet. It's probably better that this get merged for now instead of living only on my local system. 😬

It can be removed once the tool is written.

/cc @nikhita

[nikhita]

/lgtm

/hold
in case @cblecker has comments

/assign @cblecker

[spiffxp]

Totes happy to merge and iterate away from bash, but would like some usage instructions

[spiffxp]

/approve
/lgtm
/hold cancel
merge and iterate

I would rather not have @mrbobbytables feel like they have to be the one to run this not-checked-in script next time we want to remove members

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mrbobbytables, nikhita, spiffxp

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[blaisep]

Over in #2052 there's a request to implement this in a proper programming language and I wanted to offer to adapt a github action that some of us built over in:
https://github.com/cucumber/action-retire-inactive-contributors/actions/runs/4361276398/jobs/7625018582

The description of the features is in:
https://github.com/cucumber/action-retire-inactive-contributors/tree/main/features

and a general diagram is at:
https://github.com/cucumber/action-retire-inactive-contributors#now-as-a-github-action

[ryjones]

@blaisep - over at Hyperledger, we're casting about for tooling like this. Shoot me an email?