Add support to generate code for interface without a namespace (#46)

src-examples/ProxyInterfaceConsumerForAkka/Interfaces/IAddressUid.cs

@@ -0,0 +1,9 @@
+using Akka.Remote;
+
+// namespace ProxyInterfaceConsumerForAkka.Interfaces;     <-- no namespace
+
+[ProxyInterfaceGenerator.Proxy(typeof(AddressUid))]
+// ReSharper disable once CheckNamespace
+public partial interface IAddressUid
+{
+}