Changes to List a session's captured files

deleted the query request parameter q

added the new message enum value to the files/items/source response property for the response status 200

added the new optional query request parameter search

added the non-success response with the status 404

added the non-success response with the status 422

added the non-success response with the status 500

added the optional property files/items/$schema to the response with the 200 status

added the optional property files/items/display_url to the response with the 200 status

added the optional property files/items/message_id to the response with the 200 status

added the optional property files/items/phone_id to the response with the 200 status

endpoint added