Flutter Error Handling with Result, introducing neverthrow_dart

The code snippet you've provided showcases how to use the result package in a Flutter application, specifically with Riverpod for state management and hooks for UI logic. The primary goal is to handle asynchronous operations that can fail gracefully without resorting to exceptions throughout the entire flow.

Key Concepts

1. Result Package: This package provides an enum-based approach to handling success (Ok) or failure (Err) states in a single type, Result<T>. It allows you to chain operations and handle errors more explicitly than using exceptions.

2. Riverpod: A state management solution for Flutter that helps manage the application's state without boilerplate code. In this context, it is used with AsyncNotifierProvider which expects an asynchronous callback that can throw exceptions.

3. Hooks: A library that allows you to use React-like hooks in Flutter, making it easier to handle side effects and state management within widgets.

Example Breakdown

1. Booking Function

The first part of your code is a function bookingResult which attempts to book a room by chaining asynchronous operations using the result package's methods (flatMap, mapErr). If any operation fails, it returns an error wrapped in `Err

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