feat: Implement initial structure for Directus Mayo API extension

- Added main router in src/index.js to register endpoints.
- Implemented GET /mayo-api/products to fetch product list with pagination and filters.
- Implemented GET /mayo-api/dictionaries to fetch various dictionaries for frontend use.
- Created separate files for routes, repositories, serializers, and utilities to maintain clean architecture.
- Added utility functions for async handling, pagination, and order search parsing.
- Introduced serializers for products and dictionaries to format data for frontend consumption.
- Established repository functions for database queries related to products and dictionaries.
- Updated package.json to include license information.
- Created documentation for the API extension detailing current state and future implementation plans.

directus/extensions/directus-extension-mayo-api/package.json

@@ -3,6 +3,7 @@
   "description": "Please enter a description for your extension",
   "icon": "extension",
   "version": "1.0.1",
+  "license": "UNLICENSED",
   "keywords": [
     "directus",
     "directus-extension",