Add changeset system documentation

[mathiusj]

TL;DR

Add automated release workflow with changesets for version management and changelog generation.

What changed?

• Added a changeset-based release system that automates version bumping and changelog generation
• Created GitHub workflows for validating changesets in PRs and automating releases
• Added documentation explaining how to use changesets for contributors
• Implemented rake tasks for creating and managing changesets
• Added a release script for manual release management as an alternative option

How to test?

1. Create a new changeset:

   bundle exec rake changeset:add

2. Follow the prompts to select change type (patch/minor/major) and description
3. Verify the changeset file was created in .changeset/ directory
4. List pending changesets:

   bundle exec rake changeset:list

Why make this change?

This change streamlines the release process by automating version bumping and changelog generation. It ensures that all changes are properly documented and versioned according to semantic versioning principles. The changeset system makes it easier for contributors to include their changes in the release notes without having to manually edit the changelog.

[mathiusj]

• Add changeset system documentation #407 👈 (View in Graphite)
• main

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