Fix: Channel failure on shm resize due to CacheMiss#254
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If a
Publisherresizes SHM repeatedly, it can happen that the receivingMessageChanneleither fails to lease the block before it becomes deallocated, or that the associated block is no-longer leased and is deallocated when backpressure is cleared, resulting in an uncaughtCacheMissexception which kills the Task servicing the connection silently.The test case and hardening of message servicing in
MessageChannelin this PR likely closes #253.