DO NOT MERGE: Idea for interface

[jcbhmr]

This is a pretty basic action that would appear to do most(?) of what this action already does. THIS PR IS NOT INTENDED TO MERGE it's just a way to "show off" what I'm doing/thinking. 😊

Highlights:

• i split the set-secrets and delete-secrets into separate repos!
• https://github.com/jcbhmr/set-secrets
• https://github.com/jcbhmr/delete-secrets
• each of those 👆 uses a deno-based action to run gh CLI commands
• you could probably use python if you wanted instead of Deno 🤷‍♀️
• Appears to "work" (not hard crash) https://github.com/jcbhmr/secrets-sync-action/actions

Still needs:

• Variables!
• Input and feedback on interface ideas. i.e. should it be "mode" or "set-secret:" and "delete-secret" as an input or something else #103
• clarification on whether or not any of this stuff that I'm doing is ever likely to get merged or what ❤️
• testing around #65
• actual "real" tests instead of just dry-run everything (.e. a real repo/token + manual validation that it works)

[jcbhmr]

btw yes i could switch to ousing octokit instead of the gh cli, it's just that the gh cli was a bit easier for me to get working quickly