chore: watch GraphQL files and (remote) translation records

[jbmoelker]

Changes

• Adds a watcher for GraphQL files and automatically runs prep:datocms-types on changes.
• Adds a watcher for translation records in DatoCMS (remote) and automatically runs prep:download-translations on changes.

Associated issue

N/A (just improves DX)

How to test

1. Checkout this branch locally
2. Run npm run dev
3. Make a change to any .graphql file
4. Verify types are automatically updated
5. Make a change to a translation record in DatoCMS
6. Verify the updated translations are automatically downloaded

Checklist

• [x] I have performed a self-review of my own code
• [x] I have made sure that my PR is easy to review (not too big, includes comments)
• I have added/updated tests to prove that my feature works (if not possible please explain why)
• I have made changes to the README and if the change affects the project setup (npm commands changed, new service added, environmental variable added)
• I have added a decision log entry if the change affects the architecture or changes a significant technology
• [x] I have notified a reviewer