Add label bot

Label bot can add multi labeler for title, body, comments, commit messages, branch, author or files with automated status checks.

https://github.com/fuxingloh/multi-labeler

Similar to https://github.com/AdoptOpenJDK/ci-jenkins-pipelines/pull/76/. Though we can extend the label based on title to body, comments, commit messages, etc.

related with https://github.com/AdoptOpenJDK/openjdk-tests/issues/1766

Start by reading the multi-labeler project and the related issue #1766, then compare the referenced AdoptOpenJDK pull request. Define the supported label sources—title, body, comments, commit messages, branch, author, and files—and the automated status checks required before implementation can be considered complete.

Written by the indexing model from the issue text.