Image Prioritizer

This plugin optimizes the loading of images (and videos) with prioritization to improve Largest Contentful Paint (LCP), lazy loading, and more accurate image size selection.

The current optimizations include:

1. Add breakpoint-specific fetchpriority=high preload links (both as LINK[rel=preload] elements and Link response headers) for image URLs of LCP elements:
   1. An IMG element, including the srcset/sizes attributes supplied as imagesrcset/imagesizes on the LINK.
   2. The first SOURCE element with a type attribute in a PICTURE element. (Art-directed PICTURE elements using media queries are not supported.)
   3. An element with a CSS background-image inline style attribute.
   4. An element with a CSS background-image applied with a stylesheet (when the image is from an allowed origin).
   5. A VIDEO element’…