Add release drafter github action

[ssbarnea]

This change should help preparing list of release notes for future
releases. When a maintainer will want to make a release he would
be able to tune the draft release notes and copy them to the
changelog.

The biggest advantage of this change is that the creation of the
draft is automated and it already uses the desired format, with
title link to PR and mention of author, reducing the maintenance
chore when preparing for a new release.

Changelog-friendly one-liner:

Contributor checklist

• Provided the tests for the changes.
• Gave a clear one-line description in the PR (that the maintainers can add to CHANGELOG.md on release).
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

[atugushev]

Wow, that looks pretty useful! A few notes below:

[jezdez]

For the record, this needs to lose the use of the verify-pr-label-action action to be mergable. Release-drafter is already used in other Jazzband projects and is acceptable.

[ssbarnea]

@atugushev @jezdez Does it look ok now? Did I miss anything or is ready for approval. I can wait for two approvals for this one if you think that is needed.

[ssbarnea]

@atugushev Can you please review this? I would like to enable it so we can benefit from it for the new release.

[atugushev]

Thanks for pinging! A few notes below:

[ssbarnea]

@atugushev Please give it another go, I hope I addressed all comments.

[atugushev]

LGTM 👍

[jezdez]

Tiny change to the action config needed, but otherwise this looks good to me.

[ssbarnea]

@jezdez Added that change. Please do not forget to approve it. As long you appear with "requested changes" we will not be able to merge the change, regardless other approvals.

[jezdez]

@jezdez Added that change. Please do not forget to approve it. As long you appear with "requested changes" we will not be able to merge the change, regardless other approvals.

Yep, that's how it was intended. Thanks for working on this @ssbarnea!