Add a CMS Starter example

[triozer]

Description

This pull request introduces a new CMS starter example, including updates to various configuration files, data sources, and UI components. The changes aim to set up a basic CMS plugin for Framer, providing a template for further development.

QA

• Clone the repository.
• Navigate to the examples/cms directory.
• Install dependencies and start the plugin locally.
• Adding a new Collection
  • Create a new collection.
  • Open the CMS plugin.
    • Confirm a prompt appears asking to select a collection to sync.
    • Verify you can select from the available collections.
• Managing an existing Collection
  • Open an existing collection that has been set up previously.
  • Click the "Manage" button.
    • Confirm the "Field Mapping UI" is displayed.
    • Verify you can:
      • Change the slug field to a valid string field.
      • Rename fields.
      • Toggle fields on/off by clicking them.
• Syncing an existing Collection
  • Open an existing, pre-configured collection.
  • Click the "Sync" button.
    • Confirm the sync process starts immediately.
    • Verify the collection syncs with the configured data source without further setup.

Additional Checks

• Ensure all UI elements are properly styled and responsive.
• Confirm error states are handled gracefully.
• Verify field changes persist after saving.
• Ensure sync operations display appropriate loading states.

[huntercaron]

Lets call the actual folder "cms" instead of "cms-starter" since its already in a folder called "examples"