Add client handling for sampling, list roots, ping (#218)

Adds sampling and list roots callbacks to the ClientSession, allowing the client to handle requests from the server.

Co-authored-by: TerminalMan <84923604+SecretiveShell@users.noreply.github.com>
Co-authored-by: David Soria Parra <davidsp@anthropic.com>

src/mcp/shared/memory.py

@@ -9,7 +9,7 @@ from typing import AsyncGenerator
 import anyio
 from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
 
-from mcp.client.session import ClientSession
+from mcp.client.session import ClientSession, ListRootsFnT, SamplingFnT
 from mcp.server import Server
 from mcp.types import JSONRPCMessage
 
@@ -54,6 +54,8 @@ async def create_client_server_memory_streams() -> (
 async def create_connected_server_and_client_session(
     server: Server,
     read_timeout_seconds: timedelta | None = None,
+    sampling_callback: SamplingFnT | None = None,
+    list_roots_callback: ListRootsFnT | None = None,
     raise_exceptions: bool = False,
 ) -> AsyncGenerator[ClientSession, None]:
     """Creates a ClientSession that is connected to a running MCP server."""
@@ -80,6 +82,8 @@ async def create_connected_server_and_client_session(
                     read_stream=client_read,
                     write_stream=client_write,
                     read_timeout_seconds=read_timeout_seconds,
+                    sampling_callback=sampling_callback,
+                    list_roots_callback=list_roots_callback,
                 ) as client_session:
                     await client_session.initialize()
                     yield client_session