CI: add issues-helper

Created by: xrkffgg

I find you often label awaiting-reply to remind other to provide a recurrence demo.

❤️ I think this action will make it easy for you.

introduce

• issue-labeled
  • When you label awaiting-reply, the github-bot will help you comment. Like: https://github.com/xrkffgg/bootstrap/issues/1
• issue-close-require
  • When issues label awaiting-reply inactive 7 days, GitHub Actions will close the issue and comment.