[PJRT:CPU] Implement PjRtDevice::PoisonExecution() API.
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`PjRtDevice::PoisonExecution()` API provides a mechanism to mark output buffers of a pending asynchronous execution with an error, where the error is constructed above PjRt and potentially reflect a broader view on the system state. This change implements this API for the PJRT CPU client to improve support for cancelling pending executions. The state of poisonable executions is owned by `TfrtCpuDevice` and accessed from `TfrtCpuExecutable` as via a new class `TfrtCpuAsyncExecutionTracker`. PiperOrigin-RevId: 732212487
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[PJRT:CPU] Implement
PjRtDevice::PoisonExecution()API.PjRtDevice::PoisonExecution()API provides a mechanism to mark output buffersof a pending asynchronous execution with an error, where the error is
constructed above PjRt and potentially reflect a broader view on the system
state. This change implements this API for the PJRT CPU client to improve
support for cancelling pending executions. The state of poisonable executions
is owned by
TfrtCpuDeviceand accessed fromTfrtCpuExecutableas via a newclass
TfrtCpuAsyncExecutionTracker.