feat: add ClientRequestContext type alias for client-side handlers (#1989)

src/mcp/client/context.py

@@ -0,0 +1,16 @@
+"""Request context for MCP client handlers."""
+
+from mcp.client.session import ClientSession
+from mcp.shared._context import RequestContext
+
+ClientRequestContext = RequestContext[ClientSession]
+"""Context for handling incoming requests in a client session.
+
+This context is passed to client-side callbacks (sampling, elicitation, list_roots) when the server sends requests
+to the client.
+
+Attributes:
+    request_id: The unique identifier for this request.
+    meta: Optional metadata associated with the request.
+    session: The client session handling this request.
+"""