[CI] add label commenter workflow

[aminoxix]

Description:

This repository should have the label commenter workflow. It would run whenever an issue/pr is labelled with one of the targeted labels and comment down any relevant information.

Contributor Reference:

The workflow would use: https://github.com/peaceiris/actions-label-commenter

A sample workflow is defined in: https://github.com/meshery/meshery/blob/master/.github/workflows/label-commenter.yml.

It would also need a sample configuration which is defined in: https://github.com/meshery/meshery/blob/master/.github/label-commenter-config.yml

NOTE:

• In the above configuration https://github.com/meshery/meshery/blob/88d1c7c559259775ce2affab2a15a32c673c3f52/.github/label-commenter-config.yml#L26-L41 are specific to Meshery and won't be needed on every repository.
• Do comment in PR if you find any label is missing for the repo.

[monalisha31]

I am interested in working on this issue.

[warunicorn19]

Sounds good @monalisha31 😄