feat(server): Rework transport architecture and add StreamableHttpTransport (#49)

* 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

phpstan-baseline.neon

@@ -54,17 +54,6 @@ parameters:
 			count: 1
 			path: examples/02-discovery-http-userprofile/server.php
 
-		-
-			message: '#^Instantiated class StreamableHttpServerTransport not found\.$#'
-			identifier: class.notFound
-			count: 1
-			path: examples/02-discovery-http-userprofile/server.php
-
-		-
-			message: '#^Parameter \#1 \$transport of method Mcp\\Server\:\:connect\(\) expects Mcp\\Server\\TransportInterface, StreamableHttpServerTransport given\.$#'
-			identifier: argument.type
-			count: 1
-			path: examples/02-discovery-http-userprofile/server.php
 
 		-
 			message: '#^Method Mcp\\Example\\ManualStdioExample\\SimpleHandlers\:\:getItemDetails\(\) return type has no value type specified in iterable type array\.$#'
@@ -84,17 +73,6 @@ parameters:
 			count: 2
 			path: examples/04-combined-registration-http/server.php
 
-		-
-			message: '#^Instantiated class Mcp\\Server\\Transports\\HttpServerTransport not found\.$#'
-			identifier: class.notFound
-			count: 1
-			path: examples/04-combined-registration-http/server.php
-
-		-
-			message: '#^Parameter \#1 \$transport of method Mcp\\Server\:\:connect\(\) expects Mcp\\Server\\TransportInterface, Mcp\\Server\\Transports\\HttpServerTransport given\.$#'
-			identifier: argument.type
-			count: 1
-			path: examples/04-combined-registration-http/server.php
 
 		-
 			message: '#^Method Mcp\\Example\\StdioEnvVariables\\EnvToolHandler\:\:processData\(\) return type has no value type specified in iterable type array\.$#'
@@ -288,17 +266,6 @@ parameters:
 			count: 2
 			path: examples/07-complex-tool-schema-http/McpEventScheduler.php
 
-		-
-			message: '#^Instantiated class Mcp\\Server\\Transports\\HttpServerTransport not found\.$#'
-			identifier: class.notFound
-			count: 1
-			path: examples/07-complex-tool-schema-http/server.php
-
-		-
-			message: '#^Parameter \#1 \$transport of method Mcp\\Server\:\:connect\(\) expects Mcp\\Server\\TransportInterface, Mcp\\Server\\Transports\\HttpServerTransport given\.$#'
-			identifier: argument.type
-			count: 1
-			path: examples/07-complex-tool-schema-http/server.php
 
 		-
 			message: '#^Method Mcp\\Example\\SchemaShowcaseExample\\SchemaShowcaseElements\:\:calculateRange\(\) return type has no value type specified in iterable type array\.$#'
@@ -354,17 +321,6 @@ parameters:
 			count: 1
 			path: examples/08-schema-showcase-streamable/SchemaShowcaseElements.php
 
-		-
-			message: '#^Instantiated class Mcp\\Server\\Transports\\StreamableHttpServerTransport not found\.$#'
-			identifier: class.notFound
-			count: 1
-			path: examples/08-schema-showcase-streamable/server.php
-
-		-
-			message: '#^Parameter \#1 \$transport of method Mcp\\Server\:\:connect\(\) expects Mcp\\Server\\TransportInterface, Mcp\\Server\\Transports\\StreamableHttpServerTransport given\.$#'
-			identifier: argument.type
-			count: 1
-			path: examples/08-schema-showcase-streamable/server.php
 
 		-
 			message: '#^Parameter \#1 \$registry of class Mcp\\Server\\RequestHandler\\ListPromptsHandler constructor expects Mcp\\Capability\\Registry\\ReferenceProviderInterface, Mcp\\Capability\\PromptChain given\.$#'