Feature: allow timeouts in tool definition

[brettimus]

Feedback from the MCP event: One person mentioned building a lot of timeout logic himself inside tool handlers (repeatedly)

Could be nice to expose a timeout option on tools

Things to consider:

• autocancelling pending call
• message returned to client (should this be configurable?)

[laulauland]

keen to make this as a utility middleware but doubtful about adding it to the core