Only add signal handler on main thread#668
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The new runners added in #659 use signal handlers to shut down. This is because the Dask distributed scheduler and worker hang when we call
sys.exit()dask/distributed#8644.We only need to add these handlers if you're using the runners, and its probably safe to assume that the runners will only be used from the main thread. So this PR adds a check that skips adding the handler if we are in a child thread.
Closes #667