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Add hooks for calling arbitrary code around each benchmark #314

Job	Run time
tox-jobs (doc)	30s
ubuntu-latest - 3.12	45s
tox-jobs (pep8)	17s
macos-latest - 3.12	32s
windows-latest - 3.12	1m 13s
ubuntu-latest - pypy3.10	1m 13s
ubuntu-latest - pypy3.9	1m 13s
ubuntu-latest - pypy3.8	1m 3s
ubuntu-latest - 3.8	30s
ubuntu-latest - 3.9	31s
ubuntu-latest - 3.10	27s
ubuntu-latest - 3.11	28s
ubuntu-latest - 3.13-dev free-threading	1m 5s
	9m 47s

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