Rhino required fixes (#9)

* add fixes for structs

* handle null non-nullables to nullable nulls

* test fix

* add enum test even if it's gross looking

* generate nullable adapt when needed

* fix adapter tests

* don't generate static events

* fmt

* mark for release

tests/ProxyInterfaceSourceGeneratorTests/Source/IFooNotNullable.cs

@@ -0,0 +1,6 @@
+namespace ProxyInterfaceSourceGeneratorTests.Source;
+
+public partial interface IFooNotNullable
+{
+    public void Test(FooEnumImplement z = FooEnumImplement.Y, IEnumerable<string>? v = null) { }
+}