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

excalidraw-app/components/AppFooter.tsx

@@ -0,0 +1,25 @@
+import React from "react";
+import { Footer } from "../../src/packages/excalidraw/index";
+import { EncryptedIcon } from "./EncryptedIcon";
+import { ExcalidrawPlusAppLink } from "./ExcalidrawPlusAppLink";
+import { isExcalidrawPlusSignedUser } from "../app_constants";
+
+export const AppFooter = React.memo(() => {
+  return (
+    <Footer>
+      <div
+        style={{
+          display: "flex",
+          gap: ".5rem",
+          alignItems: "center",
+        }}
+      >
+        {isExcalidrawPlusSignedUser ? (
+          <ExcalidrawPlusAppLink />
+        ) : (
+          <EncryptedIcon />
+        )}
+      </div>
+    </Footer>
+  );
+});