Add ability to review deployment

**Is your feature request related to a problem? Please describe.**
Implement functionality for reviewing workflows as described here: https://docs.github.com/en/actions/managing-workflow-runs/reviewing-deployments

**Describe the solution you'd like**
Currently use VSCode for almost all Github operations but when I need to review and approve/reject a job, I must navigate to the website which breaks my flow.

Start with the linked GitHub Actions documentation on reviewing deployments, then inspect the extension's existing workflow-run functionality and available GitHub APIs. Done means users can review a deployment and approve or reject the associated job from VS Code without navigating to GitHub's website.

索引モデルが issue の本文から書いたものです。