Add SIR builder and printer for classes #KT-65905 fixed

Merge-request: KT-MR-14478
Merged-by: Artem Olkov <artem.olkov@jetbrains.com>

native/swift/sir-printer/testData/empty_class_inside_enum.golden.swift

@@ -0,0 +1,4 @@
+public enum MyEnum {
+    public class Foo {
+    }
+}