WooCommerce Product Search 5.4.0

* Update - WordPress 6.4 compatible.
* Update - WooCommerce 8.3 compatible.
* Update - Requires at least WooCommerce 7.9.
* Update - This major new release introduces a new high performance scalable search engine and cache system, engineered specifically for WooCommerce and created from the ground up.
* Update - This new search engine is unique in that it provides fast, scalable, complete and sound results for any search and filter combinations, including those involving mixes of keyword searches, categories, attributes, tags, prices, ratings, products in stock, products on sale, etc.
* Add - Introduces the new high performance search engine.
* Add - Introduces the new integrated and independent high performance cache system.
* Add - Added the built-in Transitory Cache.

* Update - WordPress 6.3 compatible.
* Update - WooCommerce 8.1 compatible.
* Update - Requires at least WooCommerce 7.8.
* Update - WordPress 6.4-alpha compatible.
* Fix - Fixed a documentation URL with a trailing space.
* Update - Revised a section of the help tab for clarity and to point to blocks, widgets and shortcodes documentation sections.
* Update - Updated the translation template.
* Update - Updated the included translations.

* Update - WordPress 6.2 compatible.
* Update - WordPress 6.4-alpha compatible.
* Update - WooCommerce 7.9 compatible.
* Update - Requires at least WooCommerce 7.7.
* Update - Requires at least PHP 7.3.
* Dev - Added guards to avoid data interference from unrelated code in the Product Search Field rendering code, fixes "undefined" displayed for invalid entries.