Moving aar to local repository and adding Version Handler

This makes the aar be pulled from a local repo using the jar resolver.
By doing this, builds in Unity can be for a single abi without
pulling in the .so for the other architectures.

Also added VersionHandler metadata to make migration of files easy.

Change-Id: Id552284801052ecb33cde2ce223048163167657b

Author: claywilkinson

GoogleSignInPlugin/Assets/GoogleSignIn/Editor/GoogleSignInDependencies.xml

@@ -3,6 +3,12 @@
   <!-- See https://github.com/googlesamples/unity-jar-resolver#usage for
     how to configure dependencies -->
   <androidPackages>
+    <!-- Internal library dependency. -->
+    <androidPackage spec="com.google.signin:google-signin-support:1+">
+      <repositories>
+        <repository>Assets/GoogleSignIn/Editor/m2repository</repository>
+      </repositories>
+    </androidPackage>
     <!--- Auth  THIS IS ALWAYS REQUIRED -->
     <!-- The dependency is actually on 10.2, but 10+ is close enough.
          If you have problems, please change this to a concrete value.

GoogleSignInPlugin/Assets/GoogleSignIn/Editor/GoogleSignInDependencies.xml.meta

@@ -0,0 +1,21 @@
+Assets/Parse/Plugins/Unity.Tasks.dll
+Assets/Parse/Plugins/Unity.Compat.dll
+Assets/Parse/LICENSE
+Assets/Plugins/iOS/GoogleSignIn/GoogleSignInAppController.h
+Assets/Plugins/iOS/GoogleSignIn/GoogleSignInAppController.mm
+Assets/Plugins/Android/native-googlesignin-release.aar
+Assets/PlayServicesResolver/Editor/Google.IOSResolver_v1.2.54.0.dll
+Assets/PlayServicesResolver/Editor/Google.VersionHandler.dll
+Assets/PlayServicesResolver/Editor/play-services-resolver_v1.2.54.0.txt
+Assets/PlayServicesResolver/Editor/Google.VersionHandlerImpl_v1.2.54.0.dll
+Assets/PlayServicesResolver/Editor/Google.JarResolver_v1.2.54.0.dll
+Assets/GoogleSignIn/GoogleSignInStatusCode.cs
+Assets/GoogleSignIn/Editor/GoogleSignInDependencies.xml
+Assets/GoogleSignIn/GoogleSignInUser.cs
+Assets/GoogleSignIn/GoogleSignIn.cs
+Assets/GoogleSignIn/Future.cs
+Assets/GoogleSignIn/Impl/SignInHelperObject.cs
+Assets/GoogleSignIn/Impl/BaseObject.cs
+Assets/GoogleSignIn/Impl/GoogleSignInImpl.cs
+Assets/GoogleSignIn/Impl/NativeFuture.cs
+Assets/GoogleSignIn/GoogleSignInConfiguration.cs