* feat(server): Rework transport architecture and add StreamableHttpTransport
- `Server::connect()` no longer contains a processing loop.
- `TransportInterface` is updated with `setMessageHandler()` and `listen()`.
- `StdioTransport` is updated to implement the new interface.
- A new, minimal `StreamableHttpTransport` is added for stateless HTTP.
* refactor(server): use event-driven message handling
* feat(server): Introduce a formal session management system
* fix: ensure session elements are preserved when building server (regression from #46)
* refactor: consolidate HTTP example to use shared dependencies
* feat(server): Enhance message handling with session support
- Updated `TransportInterface` to use `onMessage` for handling incoming messages with session IDs.
- Refactored `Server`, `Handler`, and transport classes to accommodate session management using `Uuid`.
- Introduced methods for creating sessions with auto-generated and specific UUIDs in `SessionFactory` and `SessionFactoryInterface`.
* feat(server): Integrate session management in message handling
- Added session support to the `Server` and `Handler` classes, allowing for session data to be managed during message processing.
- Updated `TransportInterface` to include session context in the `send` method.
- Refactored various request handlers to utilize session information, ensuring proper session handling for incoming requests.
- Introduced a file-based session store for persistent session data management
* feat: Update session builder method to use set* instead of with*
* feat: Fix test compatibility with new session management architecture
* chore: apply code style fixes
* fix: remove deprecated SSE transport and resolve PHPStan issues
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