chore: Added melos.yaml json schema

[leoafarias]

Melos.yaml schema validation should exist and be maintained together with melos.yaml changes.

The current melos.yaml schema is not updated with the latest options on the Melos Extension, so things like publish hooks and categories show as errors and autocomplete.

Why have it here?

• Easier to maintain, and keep it in sync iwth melos.yaml changes
• In VSCode, you do not need an extension; you can just add it on top of the melos.yaml file.

# yaml-language-server: $schema=https://raw.githubusercontent.com/../melos.yaml.schema.json

name: melos_workspace

This schema contains changes to publish hooks and category.

After this is merged, we can make a PR on the VSCode extension to use this URL in order to keep it up-to-date.

Please let me know if you need this in a different place or directory.

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [x] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [x] 📝 docs -- Documentation
• [x] 🗑️ chore -- Chore

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