Serialize constraints to yson (#8211)

Author: rvu1024

ydb/library/yql/ast/ut/ya.make

@@ -8,9 +8,11 @@ SRCS(
     yql_expr_builder_ut.cpp
     yql_expr_ut.cpp
     yql_type_string_ut.cpp
+    yql_constraint_ut.cpp
 )
 
 PEERDIR(
+    library/cpp/yson/node
 )
 
 END()