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Add hooks for calling arbitrary code around each benchmark #306

Job	Run time
tox-jobs (doc)	29s
ubuntu-latest - 3.12	32s
tox-jobs (pep8)	18s
macos-latest - 3.12	27s
windows-latest - 3.12	56s
ubuntu-latest - pypy3.10	1m 12s
ubuntu-latest - pypy3.9	1m 3s
ubuntu-latest - pypy3.8	1m 3s
ubuntu-latest - 3.8	28s
ubuntu-latest - 3.9	30s
ubuntu-latest - 3.10	27s
ubuntu-latest - 3.11	27s
ubuntu-latest - 3.13-dev free-threading	58s
	8m 50s

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