Add NativeLogBox module on iOS

Summary:
This diff adds a NativeLogBox module implementation on iOS to manage rendering LogBox the way we render RedBox, except rendering a React Native component instead of a native view.

The strategy here is:
- initialize: will create a hidden window (the way redbox does) and render the LogBox to it
- show: will show the window
- hide: will hide the window

Most of this is copied from the way RedBox works, the difference here is that we eagerly initialize the window with the `initialize` function so that it's warm by the time LogBox needs to render.

Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D18750008

fbshipit-source-id: 013e55ded55c8572bb08e0219ff4cd0060ebe0da

ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeLogBoxSpec.java

@@ -0,0 +1,31 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
+ * directory of this source tree.
+ *
+ * <p>Generated by an internal genrule from Flow types.
+ *
+ * @generated
+ * @nolint
+ */
+
+package com.facebook.fbreact.specs;
+
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.bridge.ReactContextBaseJavaModule;
+import com.facebook.react.bridge.ReactMethod;
+import com.facebook.react.bridge.ReactModuleWithSpec;
+import com.facebook.react.turbomodule.core.interfaces.TurboModule;
+
+public abstract class NativeLogBoxSpec extends ReactContextBaseJavaModule implements ReactModuleWithSpec, TurboModule {
+  public NativeLogBoxSpec(ReactApplicationContext reactContext) {
+    super(reactContext);
+  }
+
+  @ReactMethod
+  public abstract void hide();
+
+  @ReactMethod
+  public abstract void show();
+}