- Added `featured` attribute to `ProductCollectionQuery` type to enable filtering by featured status.
- Implemented `FeaturedProductsControl` to provide a toggle option in the inspector controls.
- Integrated `FeaturedProductsControl` into `ProductCollectionInspectorControls`.
- Added `get_featured_query` function in `ProductCollection` class to generate query for fetching featured products.
- Updated existing functions and queries in `ProductCollection` class to support featured products filtering.

This commit makes the handling of the 'featured' parameter consistent in the ProductCollection class. Previously, the 'featured' parameter was being type-casted to boolean, which was not necessary and could lead to incorrect results. Now, the 'featured' parameter is used directly without type-casting, and the check for 'featured' products in the get_featured_query method has been updated accordingly. This ensures that the 'featured' parameter is handled consistently and correctly throughout the class.

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This commit adds null coalescing operator to handle the case when 'featured' index is not set in the $query array. This prevents potential PHP notices or errors that may arise when trying to access an undefined index.

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