Validate that JS and Native code versions match for RN releases

Summary:
Basic implementation of the proposal in #15271

Note that this should not affect facebook internally since they are not using OSS releases.

Points to consider:
- How strict should the version match be, right now I just match exact versions.
- Wasn't able to use haste for ReactNativeVersion because I was getting duplicate module provider caused by the template file in scripts/versiontemplates. I tried adding the scripts folder to modulePathIgnorePatterns in package.json but that didn't help.
- Redscreen vs. warning, I think warning is useless because if the app crashes you won't have time to see the warning.
- Should the check and native modules be __DEV__ only?

**Test plan**
Tested that it works when version match and that it redscreens when versions don't before getting other errors on Android and iOS.
Closes https://github.com/facebook/react-native/pull/15518

Differential Revision: D5813551

Pulled By: hramos

fbshipit-source-id: 901757e25724b0f22bf39de172b56309d0dd5a95

ReactAndroid/src/main/java/com/facebook/react/modules/systeminfo/AndroidInfoModule.java

@@ -38,6 +38,7 @@ public class AndroidInfoModule extends BaseJavaModule {
     constants.put("Version", Build.VERSION.SDK_INT);
     constants.put("ServerHost", AndroidInfoHelpers.getServerHost());
     constants.put("isTesting", "true".equals(System.getProperty(IS_TESTING)));
+    constants.put("reactNativeVersion", ReactNativeVersion.VERSION);
     return constants;
   }
 }

ReactAndroid/src/main/java/com/facebook/react/modules/systeminfo/BUCK

@@ -4,6 +4,7 @@ android_library(
     name = "systeminfo",
     srcs = [
         "AndroidInfoModule.java",
+        "ReactNativeVersion.java",
     ],
     exported_deps = [
         ":systeminfo-moduleless",

ReactAndroid/src/main/java/com/facebook/react/modules/systeminfo/ReactNativeVersion.java

@@ -0,0 +1,24 @@
+/**
+ * @generated by scripts/bump-oss-version.js
+ *
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.modules.systeminfo;
+
+import com.facebook.react.common.MapBuilder;
+
+import java.util.Map;
+
+public class ReactNativeVersion {
+  public static final Map<String, Object> VERSION = MapBuilder.<String, Object>of(
+      "major", 0,
+      "minor", 0,
+      "patch", 0,
+      "prerelease", null);
+}