Finalize Docs Generator and Implement CI Check

[ricky-undeadcoders]

Work has been started on a script that can parse a composite action or reusable workflow, extract the inputs and outputs defined, and then output those inputs/outputs formatted for either a composite action, reusable workflow, or markdown table.

#1454

We should look into putting some extra love into this to do the following:

1. Write a check that verifies that .github/workflows/docker-build-push-multiarch.yml includes all of the inputs and outputs defined in actions/docker-build-push-image/action.yml.
2. Write a check that verifies that all actions have their inputs and outputs documented in the associated README.
3. Write a check to verify that any reusable workflows (in .github/workflows) have their inputs/outputs documented in an associated README.