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

tests/ProxyInterfaceSourceGeneratorTests/Source/AkkaExamples/ILocalActorRefProvider.cs

@@ -0,0 +1,6 @@
+namespace ProxyInterfaceSourceGeneratorTests.Source.AkkaActor
+{
+    public partial interface ILocalActorRefProvider
+    {
+    }
+}

tests/ProxyInterfaceSourceGeneratorTests/Source/Human.cs

@@ -1,5 +1,3 @@
-using Xunit.Sdk;
-
 namespace ProxyInterfaceSourceGeneratorTests.Source
 {
     public class Human

tests/ProxyInterfaceSourceGeneratorTests/Source/INoNamespace.cs

@@ -0,0 +1,4 @@
+// ReSharper disable once CheckNamespace
+public partial interface INoNamespace
+{
+}

tests/ProxyInterfaceSourceGeneratorTests/Source/NoNamespace.cs

@@ -0,0 +1,6 @@
+namespace ProxyInterfaceSourceGeneratorTests.Source;
+
+public class NoNamespace
+{
+    public bool Test { get; set; }
+}