WooCommerce Sequential Order Numbers Pro 1.21.4

* Fix - Use `wc_get_orders` to query orders in the lifecycle install script to avoid issues with HPOS

* Misc - Add support for the WooCommerce Checkout block
* Dev - Checkout block draft orders are considered auto-drafts for the purposes of sequential order numbers

* Tweak - Also set sequential order numbers for orders sent via the WooCommerce Checkout Block
* Fix - Ensure that searching orders in the admin screen by order number can return consistent results when using HPOS