Add ThreadMonitor to detect unresponsive threads #715
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- Switched to long running tasks to support cancellation
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This change adds a ThreadMonitor that allows threads of interest to subscribe to be monitored. Monitored threads must regularly signal to the ThreadMonitor that it's still alive. If a monitored thread fails to signal past a set time, the thread will be treated as responsive.
This change adds the main thread that hosts all of the Update logic as a monitored thread. Upon the thread becoming unresponsive, it will capture a stack trace of all threads in the process and log it as an error.