layout change UI (#776)

* add layout to schema

* add layout choice action and reducer

* multi layout UI

* update unit tests

* add missing file

* update test schema

* fix duplicate test id

* fix tabs

* PR lint

* fix pytest

client/__tests__/util/stateManager/sampleResponses.js

@@ -56,6 +56,10 @@ const aSchemaResponse = {
           categories: fieldDCategories
         }
       ]
+    },
+    layout: {
+      obs: [{ name: "umap", type: "float32", dims: ["umap_0", "umap_1"] }],
+      var: []
     }
   }
 };