Experiment: Add GitHub action to enforce tasks are checked off

[dddlr]

Adding detection for incomplete tasks in a PR description.

• This is an example GitHub action
  • I hope to check
• Add PR template
  • https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/creating-a-pull-request-template-for-your-repository
• Decide whether to put node_modules/ into .github/actions/task-checklist to speed things up

• Hello world
• This has been exempted from the task checklist

You can exempt parts the PR description from the check by adding <!-- task-checklist-ignore-start --> and <!-- task-checklist-ignore-end --> around the sections where you want to disable the check.

Alternative methods considered:

• https://github.com/kentaro-m/task-completed-checker-action doesn't appear to work
• https://github.com/venkatsarvesh/pr-tasks-completed-action doesn't give a way to skip the check

Also, with an in-house solution, we can easily extend it in the future and not need to worry about nobody owning the code.

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Latest commit: 220a881

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[dddlr]

Will make a new PR with squashed commits