WooCommerce Customer Order CSV Export 5.5.0

* Misc - Add compatibility for WooCommerce High Performance Order Storage (HPOS)
* Fix - Don't format empty strings as numbers when exporting to CSV
* Fix - Don't escape non-string values when exporting to CSV
* Fix - Address an issue with loading field mapping from existing formats when adding a custom format
* Fix - Ensure the "exported by" meta boxes are displayed on the order edit page only

* Fix - Fix dynamic property creation causing errors in PHP 8.2

* Misc - Require PHP 7.4 and WordPress 5.6