Replace release-it with custom release script

[elpoelma]

Overview

This PR replaces the release-it release flow by a custom release script which uses changesets.

The release script may do the following operations:

• Version the packages
• Commit the versioned packages
• Tag the versioned packages
• Push to a git forge
• Create github releases for the newly created tags (using octokit)

How to test/reproduce

I made a small playground repo on https://github.com/elpoelma/changesets-playground.
Feel free to fork it, and test out the scripts there.
As for this repo, we'll see how it goes for the next release 😄

Challenges/uncertainties

• There are certainly improvements to be made in the error handling of this script
• I will probably package the script as a separate package once it has been tested out a bit.
• At the moment, I hardcoded the package-name in the woodpecker release pipeline. In the future we will probably want to replace the release and release-next steps by a single release step which runs changeset publish (this command automatically adds npm next tags if necessary)
• I did not yet adjust the release-commit strategy, but we might want to use SNAPSHOT releases in the future for this.

Checks PR readiness

• npm lint
• no new deprecations