origin/search: Add support for search query language
This diff introduces a new config parameter "enable_ql"
If it's set to yes/True, the swh-search query language can be used for the archive search (if the "use query language" checkbox is enabled)
While using the /origin/search API endpoint, "use_ql=true" can be passed to use the url_pattern as the search query language input
Migrated from D6068 (view on Phabricator)