REST API: Support more JSON Schemas when filtering a response by context.

The array type, multi-types, and the additional properties keyword are now supported. Additionally, the filter recurses to an infinite depth.

Fixes #48819.

Built from https://develop.svn.wordpress.org/trunk@47758


git-svn-id: https://core.svn.wordpress.org/trunk@47534 1a063a9b-81f0-0310-95a4-ce76da25c4cd