Features/async trainer #58
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Add new Controller, AsyncTrainer, and AsyncPrioritySearch classes.
This implements a fully async version of PrioritySearch, which previously uses batching, so it can address the issue of PrioritySearch being blocked by some time-consuming runs in a batch. The periodic testing is also now non-blocking, so long as the num_threads is large enough.
The implementation is fully compatible with Trainer api. It provides an additional async_train coroutine for future fully async usages.
Preliminary tests on convex optimization worked out and showed improving performance.