Serialize package members and class names

Write KotlinInfo annotation to the facade package class

compiler/frontend/serialization/src/descriptors.proto

@@ -128,6 +128,12 @@ message Class {
   repeated int32 enum_entry = 12;
 }
 
+message Package {
+  repeated Callable member = 1;
+
+  repeated int32 class_name = 2;
+}
+
 message Callable {
   enum MemberKind {
     // 2 bits