The original REST API revisions controller relied on `wp_get_post_revisions()`, getting all revisions of a post without any possibility to restrict the result. This changeset replaces that function call with a proper `WP_Query` setup, replicating how `wp_get_post_revisions()` works while offering parameters to alter the default behavior. Props adamsilverstein, birgire, flixos90. Fixes #40510. git-svn-id: https://develop.svn.wordpress.org/trunk@43584 602fd350-edb4-49c9-b593-d223f7449a82