Add a feature switch to use @guardian/cql in the structured search component

kahuna/app/controllers/KahunaController.scala

@@ -3,7 +3,7 @@ package controllers
 import com.gu.mediaservice.lib.argo.ArgoHelpers
 import com.gu.mediaservice.lib.auth.Authentication.Principal
 import com.gu.mediaservice.lib.auth.{Authentication, Authorisation, BaseControllerWithLoginRedirects}
-import lib.{ExampleSwitch, FeatureSwitches, KahunaConfig}
+import lib.{ExampleSwitch, UseCqlChips, FeatureSwitches, KahunaConfig}
 import play.api.mvc.ControllerComponents
 import play.api.libs.json._
 
@@ -38,7 +38,7 @@ class KahunaController(
 
     val isIFramed = request.headers.get("Sec-Fetch-Dest").contains("iframe")
     val featureSwitches = new FeatureSwitches(
-      List(ExampleSwitch)
+      List(ExampleSwitch, UseCqlChips)
     )
     val featureSwitchesWithClientValues = featureSwitches.getClientSwitchValues(featureSwitches.getFeatureSwitchCookies(request.cookies.get))
     val featureSwitchesJson = Json.stringify(Json.toJson(featureSwitches.getFeatureSwitchesToStringify(featureSwitchesWithClientValues)))

kahuna/app/lib/FeatureSwitch.scala

@@ -10,6 +10,12 @@ object ExampleSwitch extends FeatureSwitch(
   default = false
 )
 
+object UseCqlChips extends FeatureSwitch(
+  key = "use-cql-chips",
+  title = "Use CQL for the chips interface",
+  default = false
+)
+
 class FeatureSwitches(featureSwitches: List[FeatureSwitch]){
   // Feature switches are defined here, but updated by setting a cookie following the pattern e.g. "feature-switch-my-key"
   // for a switch called "my-key".