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

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

packages/auth/src/index.ts

@@ -0,0 +1,11 @@
+import {
+  moduleDefinition,
+  revertMigration,
+  runMigrations,
+} from "./module-definition"
+
+export default moduleDefinition
+export { revertMigration, runMigrations }
+
+export * from "./initialize"
+export * from "./loaders"