feat(SW-497): Added global alerts query and typings

lib/graphql/Query/SiteConfiguration.graphql

@@ -0,0 +1,18 @@
+#import "../Fragments/GlobalAlert.graphql"
+
+query GetSiteConfiguration($locale: String!) {
+  all_site_configuration(limit: 1, locale: $locale) {
+    items {
+      sitewide_alert {
+        booking_widget_disabled
+        alertConnection {
+          edges {
+            node {
+              ...GlobalAlert
+            }
+          }
+        }
+      }
+    }
+  }
+}