Wp Rocket 3.17.2.1

Enhancement: Update minimum WP version to 5.4
Enhancement: Implement a new UI for Optimized CSS Delivery
Enhancement: Move WebP Compatibility option to a One-Click Rocket Add-on
Enhancement: Add expiration rules for avif image format
Enhancement: Remove the Disable Embeds option
Enhancement: Remove the Delete Expired Transients option
Enhancement: Empty some files no longer needed

Regression: Revert the delay JS script to the previous version (reverting #4306)

Enhancement: Update delay JS script to catch click events before the scripts are loaded
Enhancement: Add the delay JS script to the page after the meta charset if it's present
Enhancement: Remove the clear cache notice after using clear used CSS since it also clears the cache
Bugfix: Prevent a possible error on WooCommerce product pages with delay JS enabled
Bugfix: Prevent a possible PHP notice in some cases when using remove unused CSS
3rd party compatibility: Improve delay JS compatibility with a number of scripts