Extend Camino interface contracts

proto/camino/schema.proto

@@ -121,6 +121,8 @@ message InterfaceFieldContract {
   bool watchable = 4;
   string type_param = 5;
   TypeRef type = 6;
+  string ref_target_type_param = 7;
+  Cardinality edge_cardinality = 8;
 }
 
 message InterfaceImplementationSchema {
@@ -134,6 +136,7 @@ message InterfaceSchema {
   repeated FieldSchema fields = 3;
   string source_file = 4;
   string proto_message = 5;
+  repeated string type_parameters = 6;
 }
 
 enum FieldImplementation {