feat: add support for label colours

[overbit]

Description:
Add support for colours for labels maintaining back compatibility with the current configuration file format and the new version that will permit to select colours

Related issue:
#76

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[overbit]

@MaksimZhukov do you know if anyone would have any time to review this?

[overbit]

@MaksimZhukov any update? Is it worth me resolving the conflicts?

[learndevops33]

awaiting for this feature.

[overbit]

I'm assuming that since the PR was approved, it's worth resolving the conflict. I'll do it ASAP @farhad-ris

[cmflynn]

any update @overbit?

[seonWKim]

@MaksimZhukov I think this will be super useful feature. Any plan to review this feature? 🙏

[overbit]

@farhad-ris @seonWKim @cmflynn PR updated to support latest version of the code. Sorry for the long wait

[marcosloic]

await Promise.all(labels.map(l => {
      const [label, colour] = l;
      if (color) {
        return client.rest.issues.updateLabel({
          owner: github.context.repo.owner,
          repo: github.context.repo.repo,
          name: label,
          color: color?.replace('#', '')
        });
      }
    })

[marcosloic]

Awaiting promises in loops is always nasty. From memory, promises awaited in for .. of will be fired sequentially rather than in parallel, which is rarely what we want