[multistage] query cancel for multi-stage engine

[walterddr]

https://github.com/apache/pinot/pull/9171 added support for query cancelation

This is a bit more complex in multi-stage engine as there are multiple stage in various distributed machines.

This issue tracks the effort to enable query cancellation on multi-stage engine

• [ ] managed running tasks on multistage QueryServer which is the GRPC entrypoint
• [ ] periodic clean up task for finished jobs (such as mailbox to channel hash map)
• [ ] allow multi-stage engine to issue cancellation GRPC proto service to QueryServer
• [ ] enable QueryDispatcher endpoint to do query cancellation