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

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

packages/auth/mikro-orm.config.dev.ts

@@ -0,0 +1,8 @@
+import * as entities from "./src/models"
+
+module.exports = {
+  entities: Object.values(entities),
+  schema: "public",
+  clientUrl: "postgres://postgres@localhost/medusa-auth",
+  type: "postgresql",
+}