refactor: move excalidraw-app outside src (#6987)

* refactor: move excalidraw-app outside src

* move some tests to excal app and fix some

* fix tests

* fix

* port remaining tests

* fix

* update snap

* move tests inside test folder

* fix

* fix

src/tests/viewMode.test.tsx

@@ -1,5 +1,5 @@
 import { render, GlobalTestState } from "./test-utils";
-import ExcalidrawApp from "../excalidraw-app";
+import { Excalidraw } from "../packages/excalidraw/index";
 import { KEYS } from "../keys";
 import { Keyboard, Pointer, UI } from "./helpers/ui";
 import { CURSOR_TYPE } from "../constants";
@@ -12,7 +12,7 @@ const pointerTypes = [mouse, touch, pen];
 
 describe("view mode", () => {
   beforeEach(async () => {
-    await render(<ExcalidrawApp />);
+    await render(<Excalidraw />);
   });
 
   it("after switching to view mode – cursor type should be pointer", async () => {