Feat: Implement Session and Stateless Session subsystems

[3m1n3nc3]

Background: Applications require both standard session management (stateful, server-backed) and stateless session alternatives (signed cookies, token-based).

Tasks:

• Create a new package [@h3ravel/session] in the framework/packages directory
• Design base Session interface/contract (get/set/forget/regenerate).
• Implement a stateful session driver (e.g., in-memory + file + DB driver).
• Implement a stateless driver (signed cookies or JWT-backed).
• Provide configuration for driver selection and driver options.
• Add middleware to inject session into HTTP requests/responses.
• Unit and integration tests for both drivers and middleware.
• Document session lifecycle and config in the guide directory of the website repo.

Acceptance criteria:

• App can switch session.driver = 'stateless' | 'stateful' in config.
• Stateless driver signs/encrypts session payload and validates on each request.
• Tests show session persistence and regeneration behavior.
• Interface mirrors laravel as much as possible, creating the familiar DX while also adding it own unique twists and turns.

Difficulty: large