Implement SEP-1686: Tasks #1060
Description
This is a tracking issue for implementation of SEP-1686.
Summary
This SEP introduces a general-purpose Tasks capability for managing long-running operations in MCP, generalizing task management to all JSON-RPC requests. The TypeScript SDK needs to implement support for servers to initiate operations and return immediately with task identifiers, enable clients to check back periodically for results or subscribe to task completion notifications, handle disconnections and reconnections gracefully, and provide APIs for managing multiple concurrent long-running tasks across all MCP operations to enable more resilient handling of asynchronous operations.