Switch notebook editors to monaco (#239)

* Upgrade nteract packages and related dependencies to make new stateful-component work

* Switch to new monacoEditor

* Configure store using nteract mythic configuration

* Replace CodeMirror with Monaco editor in NotebookReadOnlyRenderer

* Reformat

* Upgrade d3 to latest to resolve d3-selection conflicts with nteract/data-explorer that broke D3ForceGraph

* Upgrade jupyterlab terminal widget to work with latest version of react. Upgrade jupyterlab services to include latest fix for websocket auth

* Update jest test snapshots

* Upgrade packages to fix build issues

* Remove comment

* Fix unit tests

* Fix unit test snapshot

* Remove useless @types/node-fetch

src/Utils/arm/request.test.ts

@@ -1,4 +1,11 @@
 import { armRequest } from "./request";
+import fetch from "node-fetch";
+
+interface Global {
+  Headers: unknown;
+}
+
+((global as unknown) as Global).Headers = ((fetch as unknown) as Global).Headers;
 
 describe("ARM request", () => {
   it("should call window.fetch", async () => {