Add a GitHub action to release a new package version

[jfmengels]

This is an idea for an additional workflow for packages created using "new-package".
I've been feeling blocked from releasing a package when I didn't have a computer available and only had my phone.

This script should:

• Ask for the expected release version (e g. "1.1.0")
• Run 'npm run elm-bump'
• check the version in elm.json and check that it's the same as the expected release version
• Commit with the release version number as the message
• Push to the main branch

Then another action will be triggered to actually publish the version.

Help appreciated 😃

[lishaduck]

This is just asking for dillonkearns/elm-publish-action to be setup by default, right?