[FEATURE] Disconnect connections without running operations after engine maxlife time graceful period

[turboFei]

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Describe the feature

We found that, some kyuubi connections(maybe managed by jdbc connection pool likes hikari) always keep alive, and the engine can not be terminated after exceeds the max life time.

So, we can introduce a graceful period after spark engine max life time, after the graceful period, the connections without running operations will be disconnected forcibly.

Motivation

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Describe the solution

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Additional context

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Are you willing to submit PR?

• Yes. I would be willing to submit a PR with guidance from the Kyuubi community to improve.
• No. I cannot submit a PR at this time.