add stale bot actions

[mkusaka]

I would like to use this as a basis for discussion.

This PR try to add stale bot actions.

Motivations are described at #10138.

I think it's worth using this bot in, but how about it?

note: I think we can still use stalebot for github apps, but it seems that github actions version stalebot has more options.

close: #10138

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  For Windows users, please run the script in Git BASH.
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[wing328]

@mkusaka thanks for the PR. We'd similar discussions before but since we use the issue tracker for discussion as well, we decide not to use the Slate bot.

[mkusaka]

@wing328 Oh. OK. I understood. I will close this PR. Thank you :).