feat: Add enum support to contextual attribute binding (#60092)

Support UnitEnum and backed enums in Container attribute bindings:
- Auth, Authenticated, and Cache attributes now accept enum values
- Updated parameter types to accept UnitEnum|string|null
- Added comprehensive tests for unit and backed enum bindings
- Tests cover AuthGuardUnitEnum, AuthGuardBackedEnum, CacheStoreUnitEnum, and CacheStoreBackedEnum