Improve performace of TiledDataset repr (#467) #1448

Job	Run time
sdist_verify	14s
allowed-fail-tests / Load tox environments	6s
docs / Load tox environments	8s
tests / Load tox environments	7s
allowed-fail-tests / py311-devdeps (ubuntu-latest)	4m 29s
tests / py312 (ubuntu-latest)	4m 25s
tests / py311 (ubuntu-latest)	3m 39s
tests / py311-online (windows-latest)	6m 7s
tests / py310 (macos-latest)	4m 11s
tests / py310-oldestdeps (ubuntu-latest)	3m 23s
docs / build_docs-notebooks (ubuntu-latest)	4m 51s
publish / Build source and wheel distribution	3m 8s
notify	7s
	34m 55s

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