U4-9322 - begin implementing scoped repository caches

src/Umbraco.Core/Scoping/RepositoryCacheMode.cs

@@ -0,0 +1,16 @@
+namespace Umbraco.Core.Scoping
+{
+    public enum RepositoryCacheMode
+    {
+        // ?
+        Unspecified = 0,
+
+        // the default, full L2 cache
+        Default = 1,
+
+        // a scoped cache
+        // reads from and writes to a local cache
+        // clears the global cache on completion
+        Scoped = 2
+    }
+}