KT-11588 Type aliases

Resolution & expansion for type aliases.
NB: Nested type aliases capturing type parameters of outer classes are not supported yet.

compiler/tests/org/jetbrains/kotlin/test/util/RecursiveDescriptorProcessorTest.java

@@ -129,6 +129,12 @@ public class RecursiveDescriptorProcessorTest extends KotlinTestWithEnvironment
                 return true;
             }
 
+            @Override
+            public Boolean visitTypeAliasDescriptor(TypeAliasDescriptor descriptor, Void data) {
+                add(descriptor); // TODO typealias
+                return null;
+            }
+
             @Override
             public Boolean visitModuleDeclaration(ModuleDescriptor descriptor, Void data) {
                 add(descriptor);