feat: parse struct as map and render as json

[BordalloG]

Contributor checklist

Leave anything that you believe does not apply unchecked.

• I accept the AI Policy, or AI was not used in the creation of this PR.
• Bug fixes include regression tests
• Chores
• Documentation changes
• Features include unit/acceptance tests
• Refactoring
• Update dependencies

Implementation for the issue #416

• Created a new module Preferences that use Ash.TypedStruct.
• Added a new attribute preferences to the User Resource.
• Generated the migrations/snapshots.
• Seeded the user with the default data for the preferences typed structure
• Added a new overload to render_attribute that transform the typed structure into a map and recursively call it to use the implementation of a map, hence rendering it like a json.

I did not add any tests because render_attribute is private, and I did not find any obvious place where I should add it. Let me know if that is ok, or you would prefer a test case somewhere.