* Add columns control to product collection block editor settings
- `InspectorControls` from './inspector-controls' is now imported in `edit.tsx` and used in the returned JSX of `Edit` function.
- A new file `columns-control.tsx` is added under 'product-collection' block's 'inspector-controls' directory which exports a `ColumnsControl` component. This component uses `RangeControl` from '@wordpress/components' to control the number of columns in the product collection display layout when the layout type is 'flex'.
- The types file (`types.ts`) for 'product-collection' block is updated. The `Attributes` interface is renamed to `ProductCollectionAttributes` and the `ProductCollectionContext` interface is removed. The `ProductCollectionAttributes` now includes 'queryContext', 'templateSlug', and 'displayLayout' properties.
* Refactor: Simplify Fallback Return in ColumnsControl Component
This commit simplifies the fallback return value of the ColumnsControl component. Instead of returning an empty fragment (<> </>), it now returns null when the condition isn't met. This change improves readability and aligns with best practices for conditional rendering in React.
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