feat: github app authentication and repo standardization

[jmeridth]

The size of this PR is necessary. Not my usual PR size.

No external changes from a user's perspective but a bit of an overhaul/refactor. I'd still say a minor release, not major. Unless we feel setting minimum python to 3.10. We are building the action with 3.12 now but test against 3.10+.

Pull Request

Proposed Changes

• [x] setting minimum python to 3.10 (allows usage of unions on types)
• [x] add ability for users to authenticate with GitHub App Installation
• [x] standardize repo
  • [x] Makefile
  • [x] Linting
  • [x] same workflows as other OSPO GitHub Actions
• [x] add @jmeridth to CODEOWNERS
• [x] update .env-example
• [x] update README
• [x] standardize all workflows (including examples) permissions
  • [x] contents: read by default
  • [x] more details in jobs
• [x] add tests
  • [x] coverage to 60% for now, will get above 80% later

Readiness Checklist

Author/Contributor

• [x] If documentation is needed for this change, has that been included in this pull request
• [x] run make lint and fix any issues that you have introduced
• [x] run make test and ensure you have test coverage for the lines you are introducing

Reviewer

• [x] Label as either bug, documentation, enhancement, infrastructure, or breaking

[jmeridth]

That should have been run against python 3.10, not python 3.1. 😕

Re-running.

UPDATE: Versions needed to be in string format