Add hooks for calling arbitrary code around each benchmark #305

Job	Run time
tox-jobs (doc)	27s
ubuntu-latest - 3.12	32s
tox-jobs (pep8)	18s
macos-latest - 3.12	29s
windows-latest - 3.12	1m 4s
ubuntu-latest - pypy3.10	1m 11s
ubuntu-latest - pypy3.9	1m 6s
ubuntu-latest - pypy3.8	1m 8s
ubuntu-latest - 3.8	26s
ubuntu-latest - 3.9	26s
ubuntu-latest - 3.10	28s
ubuntu-latest - 3.11	28s
ubuntu-latest - 3.13-dev free-threading	1m 26s
	9m 29s

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