Release notes for `0.94.0`

[devyn]

Please add your new features and breaking changes to the release notes by opening PRs against the release-notes-0.94.0 branch.

TODO

• [ ] look at interesting contributions
• [ ] write all the sections
• [ ] order the sections by interest
• [ ] add the breaking changes
• [ ] detail the breaking changes
• [ ] add the full changelog
• [ ] complete all the TODOs inside the release note
• [ ] ... (PRs that need to land before the release, e.g. deprecations or removals)