feat(utils): custom serialization that allows for non self ref (#6836)

* feat(utils): custom serialization that allows for non self ref

* Create fast-teachers-greet.md

* cleanup + tests

* cleanup + tests

* fix import

* fix map to pk relations

.changeset/fast-teachers-greet.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/utils": patch
+---
+
+feat(utils): custom serialization that allows for non self ref