[changelog] Provide capabilities to group multiple dependabot PRs for the same artifact

[netomi]

When dependabot is enabled for a repo and you merge suggested changes / updates on a regular basis, the resulting changelog gets quickly difficult to read as the same artifact might be repeated multiple times.

It would be great if jreleaser would have the ability to group such dependabot PRs by artifact to look like that:

Bump checkstyle from 10.7.0 to 10.12.1 by https://github.com/dependabot (#257, #260, #268, #274, #289, #295, #309)

instead of individual entries for each incremental update.

This is similar to the ticket I opened here: release-drafter/release-drafter#1370
If this is something that you would like to see I can work similarly on a PR for jreleaser as well.

[aalmiray]

Yes, we'd like to have such an option but in a much broader sense: ability to group any set of commits given certain conditions and generate one or more entries in the changelog with specific formatting rules.