* Add a new endpoint to get low in stock products.
* Set images and attributes property
* WIP -- set last order date
* Do not join postmeta if store does not have any custom stock threshold
* Combine get_query() and get_query_for_sitewide_threshold() into one method and a few code clean ups
* Support status field
* Use new products/low-in-stock endpoint to count low in stock products.
* Use new products/low-in-stock to get low in stock products data.
* Remove low_in_stock support
* Deprecate low_in_stock
* Use the new ProductsLowInStock when low_in_stock is set
* Set cache-control header for the new endpoint
* Use wc_rest_prepare_date_response to format the response date
* Extract low in stock test to a separate file
* Make is_using_sitewide_stock_threshold_only protected
* Revert Products.php changes
* Add back low in stock test to products test
* Remove unnecessary if
* Make the controller final
* Deprecate low_in_stock
* Bug fix -- last_order_date was not setting correctly for variation post type. This commit fixes it
* Add changelog
6f163b4cee