Yarn workspaces

Summary:
1) moved "sonar/desktop/src" to "sonar/desktop/app/src", so "app" is now a separate package containing the core Flipper app code
2) Configured yarn workspaces with the root in "sonar/desktop": app, static, pkg, doctor, headless-tests. Plugins are not included for now, I plan to do this later.

Reviewed By: jknoxville

Differential Revision: D20535782

fbshipit-source-id: 600b2301960f37c7d72166e0d04eba462bec9fc1

desktop/app/src/store.tsx

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {createStore} from 'redux';
+import reducers, {Actions, State as StoreState} from './reducers/index';
+import {stateSanitizer} from './utils/reduxDevToolsConfig';
+import isProduction from './utils/isProduction';
+
+export const store = createStore<StoreState, Actions, any, any>(
+  reducers,
+  window.__REDUX_DEVTOOLS_EXTENSION__
+    ? window.__REDUX_DEVTOOLS_EXTENSION__({
+        // @ts-ignore: stateSanitizer is not part of type definition.
+        stateSanitizer,
+      })
+    : undefined,
+);
+
+if (!isProduction()) {
+  // For debugging purposes only
+  // @ts-ignore
+  window.flipperStore = store;
+}