**What**
Update the `MedusaService` class, factory and types to remove the concept of main modules. The idea being that all method will be explicitly named and suffixes to represent the object you are trying to manipulate.
This pr also includes various fixes in different modules
Co-authored-by: Stevche Radevski <4820812+sradevski@users.noreply.github.com>
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
* chore: Clean up authentication middlewares
* chore: Rename AuthUser to AuthIdentity
* feat: Define link between user, customer, and auth identity
* feat: Use links for auth, update auth context content
* fix: Adjust user create command with new auth setup
* fix: Make auth login more dynamic, review fixes
* fix: Change test assertions for created by
