Previously, the search controller infrastructure required that the id property was an integer. This prevents data models that use a string id from utilizing the search infrastructure.
This commit lifts the restraint that search handlers return integer ids. This will allow for the Post Formats search handler coming in 5.6 to use slugs instead of creating fake ids.
Props stoyangeorgiev.
Fixes#51131.
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Introduces a `WP_REST_Search_Controller` class which registers a `/wp/v2/search` endpoint. Search types are handled by extending `WP_REST_Search_Handler`. The default search type is `WP_REST_Post_Search_Handler` but can be filtered by plugins or a theme.
Merges [43739,43741] from the 5.0 branch to trunk.
Props danielbachhuber, flixos90, pento, rmccue, joehoyle.
Fixes#39965.
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