KAFKA-15867: Should ConsumerNetworkThread wrap the exception and notify the polling thread?

[Phuc-Hong-Tran]

Changes:

1. Added backgroundEventHandler to ConsumerNetworkThread to handle unexpected exception.

Committer Checklist (excluded from commit message)

• [ ] Verify design and implementation
• [ ] Verify test coverage and CI build status
• [ ] Verify documentation (including upgrade notes)

[Phuc-Hong-Tran]

@philipnee, PTAL. Thanks in advance

[Phuc-Hong-Tran]

@kirktrue, I will

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