Update Microsoft Crank to be consumable as a GitHub action

**Required updates to use crank as a GitHub action**

- [x] Evaluate crank .exe/.dll (executable) entry point - [PR](https://github.com/dotnet/crank/pull/267)
- [ ] Determine parameters
- [ ] Map to action inputs
- [ ] Determine outputs
- [ ] Crank needs to be containerized, _Dockerfile_
- [ ] An action.yml file needs to exist in order to expose the crank repo to the GitHub action marketplace
- [ ] Provide an example _crank-workflow.yml_ file, to exemplify how to use it
- [ ] Assuming there is composition involved, you'd show how to filter out no-command comments
- [ ] Show `pull_request_review_comment` trigger
- [ ] Publish to the marketplace
- [ ] Consume it

Feel free to assign this to me, I'm working on it. /cc @davidfowl