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/utils/openssl-wrapper-with-promises.tsx

@@ -0,0 +1,27 @@
+/**
+ * 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 {exec as opensslWithCallback, Action} from 'openssl-wrapper';
+import child_process from 'child_process';
+
+export function openssl(action: Action, options: {}): Promise<string> {
+  return new Promise((resolve, reject) => {
+    opensslWithCallback(action, options, (err, buffer) => {
+      if (err) {
+        reject(err);
+      } else if (buffer) {
+        resolve(buffer.toString());
+      }
+    });
+  });
+}
+
+export function isInstalled(): boolean {
+  return !child_process.spawnSync('openssl', ['version']).error;
+}