Mihir Singh

added test_ring_queue.cpp, modified RingQueue capacity() definition

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#726 **Changes** 1. [880ee1c](https://github.com/roc-streaming/roc-toolkit/pull/743/commits/880ee1c9dc9625df5752d9fca624fe276f899904) - Wrote unit tests for RingQueue class - Changed the definition of capacity() in ring_queue.h - Before making this change, if an element was added when...

Add StateTracker::wait_state()

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Implements #749