feat: Add support for generating changelogs

[halkeye]

• See https://artifacthub.io/docs/topics/annotations/helm/
• trim out any blank lines

You can see it working https://github.com/halkeye/test-semantic-release-helm3/tree/5a231415e801a4c38aab759b6031f77f69a8980c

[halkeye]

hopefully that works for you, i didn't want to add spacing to each other parameter

[nflaig]

LGTM

[nflaig]

Thanks btw for the thorough testing 👍

[nflaig]

Published semantic-release-helm3@2.4.0

[halkeye]

sweet, with this i can have version bumps when renovate updates the images 🤞