Add input to set version code

Use action input `androidVersionCode` when provided. Generate the androidVersionCode from the version otherwise.

action/default-build-script/Assets/Editor/Versioning/VersionApplicator.cs

@@ -1,5 +1,4 @@
 using System;
-using JetBrains.Annotations;
 using UnityEditor;
 
 namespace UnityBuilderAction.Versioning
@@ -11,10 +10,14 @@ namespace UnityBuilderAction.Versioning
       if (version == "none") {
         return;
       }
-      
+
       Apply(version);
     }
 
+    public static void SetAndroidVersionCode(string androidVersionCode) {
+      PlayerSettings.Android.bundleVersionCode = Int32.Parse(androidVersionCode);
+    }
+
     static void Apply(string version)
     {
       PlayerSettings.bundleVersion = version;