[orc-rt] Add QueueingTaskDispatcher API. #172401
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QueueingTaskDispatcher adds Tasks to a the back of a double ended queue that is accessible to clients via the
pop_backandpop_frontmethods. Clients can manually take and run tasks, or callrunLIFOUntilEmptyorrunFIFOUntilEmptyto run tasks until the queue is empty.QueueingTaskDispatcher is intended for use in unit tests, and as a foundation for blocking convenience APIs in environments without threads. QueueingTaskDispatcher should generally be avoided, and ThreadPoolTaskDispatcher preferred, where threads are available.