Add a couple of repr benchmarks (#468) #1397

Job	Run time
sdist_verify	14s
docs / Load tox environments	4s
allowed-fail-tests / Load tox environments	4s
tests / Load tox environments	3s
tests / py312 (ubuntu-latest)	4m 59s
tests / py311 (ubuntu-latest)	3m 44s
tests / py311-online (windows-latest)	5m 34s
tests / py310 (macos-latest)	4m 7s
tests / py310-oldestdeps (ubuntu-latest)	3m 28s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	4m 25s
docs / build_docs-notebooks (ubuntu-latest)	4m 39s
publish / Build source and wheel distribution	6m 12s
notify	9s
	37m 42s

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