[dpl] support yieldable log processing #29
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There are many scenarios where the core performing log processing is also performing other I/O bound workloads and the log processing is not the highest priority task.
This PR preserves the default behavior of
DebugP_shm_log_reader(reading all available logs, blocking until all are processed) but exposes an API that allows yielding and after a certain number of lines have been processed.