support triggering a graceful shutdown from within the worker process #49

Job	Run time
Validate coverage	27s
Build the documentation	24s
Lint the package	43s
Python: 3.7-x64 on ubuntu-latest	25s
Python: 3.7-x64 on windows-2022	55s
Python: 3.7-x86 on windows-2022	1m 4s
Python: 3.7-x64 on macos-12	38s
Python: 3.8-x64 on ubuntu-latest	27s
Python: 3.8-x64 on windows-2022	41s
Python: 3.8-x86 on windows-2022	59s
Python: 3.8-x64 on macos-12	41s
Python: 3.9-x64 on ubuntu-latest	25s
Python: 3.9-x64 on windows-2022	45s
Python: 3.9-x86 on windows-2022	1m 1s
Python: 3.9-x64 on macos-12	33s
Python: 3.10-x64 on ubuntu-latest	28s
Python: 3.10-x64 on windows-2022	54s
Python: 3.10-x86 on windows-2022	47s
Python: 3.10-x64 on macos-12	43s
Python: 3.11-x64 on ubuntu-latest	26s
Python: 3.11-x64 on windows-2022	49s
Python: 3.11-x86 on windows-2022	1m 7s
Python: 3.11-x64 on macos-12	36s
Python: 3.12-x64 on ubuntu-latest	28s
Python: 3.12-x64 on windows-2022	56s
Python: 3.12-x86 on windows-2022	1m 12s
Python: 3.12-x64 on macos-12	1m 4s
Python: pypy-3.8-x64 on ubuntu-latest	41s
Python: pypy-3.8-x64 on windows-2022	1m 37s
Python: pypy-3.8-x86 on windows-2022	1m 39s
Python: pypy-3.8-x64 on macos-12	1m 6s
	24m 41s

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