Feat(auth): Rename authentication to auth (#6229)

**What**
- rename `authenticationModule` -> `authModule`

packages/auth/src/models/auth-user.ts

@@ -0,0 +1,55 @@
+import {
+  BeforeCreate,
+  Cascade,
+  Entity,
+  Index,
+  ManyToOne,
+  OnInit,
+  OptionalProps,
+  PrimaryKey,
+  Property,
+  Unique,
+} from "@mikro-orm/core"
+
+import AuthProvider from "./auth-provider"
+import { generateEntityId } from "@medusajs/utils"
+
+type OptionalFields = "provider_metadata" | "app_metadata" | "user_metadata"
+
+@Entity()
+@Unique({ properties: ["provider","entity_id" ], name: "IDX_auth_user_provider_entity_id" })
+export default class AuthUser {
+  [OptionalProps]: OptionalFields
+
+  @PrimaryKey({ columnType: "text" })
+  id!: string
+
+  @Property({ columnType: "text" })
+  entity_id: string
+
+  @ManyToOne(() => AuthProvider, {
+    joinColumn: "provider",
+    fieldName: "provider_id",
+    cascade: [Cascade.REMOVE],
+  })
+  provider: AuthProvider
+
+  @Property({ columnType: "jsonb", nullable: true })
+  user_metadata: Record<string, unknown> | null
+
+  @Property({ columnType: "jsonb", nullable: true })
+  app_metadata: Record<string, unknown> | null
+
+  @Property({ columnType: "jsonb", nullable: true })
+  provider_metadata: Record<string, unknown> | null
+
+  @BeforeCreate()
+  onCreate() {
+    this.id = generateEntityId(this.id, "authusr")
+  }
+
+  @OnInit()
+  onInit() {
+    this.id = generateEntityId(this.id, "authusr")
+  }
+}