Add get longest runs operation

src/operations/leaderboards.gql

@@ -12,3 +12,17 @@ query GetMakesLeaderboard($interval: TimeInterval, $when: DateTime) {
     }
   }
 }
+
+query GetRunsLeaderboard($interval: TimeInterval, $when: DateTime) {
+  getLongestRunsLeaderboard(interval: $interval, when: $when) {
+    entries {
+      id
+      runLength
+      user {
+        id
+        username
+        profileImageUri
+      }
+    }
+  }
+}