Support physical device logging

Summary:
Changelog: Logs plugin now supports physical iOS devices

As reported in https://github.com/facebook/flipper/issues/262 and linked papercut.

This diff adds support for iOS device logs through idb. Since idb doesn't respect `--json` flag at the moment, we perform the parsing in Flipper itself.

Reviewed By: passy

Differential Revision: D27346262

fbshipit-source-id: 3b314716f48bb9a7fe709370303396a51893359c

desktop/app/src/dispatcher/__tests__/iOSDevice.node.tsx

@@ -64,7 +64,9 @@ test('test getAllPromisesForQueryingDevices when xcode detected', () => {
   const promises = getAllPromisesForQueryingDevices(
     mockStore,
     logger,
-    {},
+    {
+      idbAvailable: false,
+    },
     true,
   );
   expect(promises.length).toEqual(3);
@@ -74,7 +76,9 @@ test('test getAllPromisesForQueryingDevices when xcode is not detected', () => {
   const promises = getAllPromisesForQueryingDevices(
     mockStore,
     logger,
-    {},
+    {
+      idbAvailable: true,
+    },
     false,
   );
   expect(promises.length).toEqual(1);