Bloc Superpowers

Bloc Superpowers is a Flutter/Dart package that enhances Cubits with a `mix` function wrapper. It eliminates the need for manual loading and error state management by providing built-in helpers like `isWaiting()` and `isFailed()`. The package includes features for retry logic with exponential backoff, non-reentrant execution, internet connectivity checks, debouncing, throttling, sequential processing, and optimistic UI updates. It also introduces Effects for one-time notifications that replace BlocListener, making it easier to trigger side effects like dialogs or navigation directly in the build method.