feat(auth): Revamp authentication setup (#7387)

* 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

packages/modules/auth/src/joiner-config.ts

@@ -1,10 +1,10 @@
-import { AuthUser } from "@models"
+import { AuthIdentity } from "@models"
 import { MapToConfig } from "@medusajs/utils"
 import { ModuleJoinerConfig } from "@medusajs/types"
 import { Modules } from "@medusajs/modules-sdk"
 
 export const LinkableKeys = {
-  auth_user_id: AuthUser.name,
+  auth_identity_id: AuthIdentity.name,
 }
 
 const entityLinkableKeysMap: MapToConfig = {}
@@ -23,9 +23,9 @@ export const joinerConfig: ModuleJoinerConfig = {
   primaryKeys: ["id"],
   linkableKeys: LinkableKeys,
   alias: {
-    name: ["auth_user", "auth_users"],
+    name: ["auth_identity", "auth_identities"],
     args: {
-      entity: AuthUser.name,
+      entity: AuthIdentity.name,
     },
   },
 }