Changeset 53152 for trunk/src/wp-includes/rest-api/endpoints/class-wp-rest-block-pattern-categories-controller.php

REST API: Bring new endpoints for Block Patterns from Gutenberg plugin

Related Gutenberg issue: ​https://github.com/WordPress/gutenberg/issues/39889.

Backporting changes from the Gutenberg plugin:

• new Block Patterns REST API endpoint
• new Block Pattern Categories REST API endpoint
• updates to Query Loop related patterns
• support for custom taxonomies in Query Loop block

Props hellofromtonya, peterwilsoncc, ntsekouras, zieladam, ironprogrammer, spacedmonkey, timothyblynjacobs, antonvlasenko, jsnajdr.
See #55505.