feat(customer): manage default address selection (#6295)

**What**
- Catches unique constraints on customer_id, is_default_billing/is_default_shipping and reformats
- Adds an step to create and update of addresses that unsets the previous default shipping/billing address if necessary.
  - This creates a behavior in the API where you can always set an address to be default and it will automatically unset the previous one for you.

packages/utils/src/exceptions/index.ts

@@ -0,0 +1,2 @@
+export * from "./postgres-error"
+export * from "./is-duplicate-error"