refactor: Rename `MatplotlibWriter` to `MatplotlibDataset` #2985

Job	Run time
check-docs	2m 1s
detect-secrets / detect-secrets	39s
lint / lint	37s
unit-tests (ubuntu-latest, 3.10) / unit-tests	6m 18s
unit-tests (ubuntu-latest, 3.11) / unit-tests	6m 2s
unit-tests (ubuntu-latest, 3.12) / unit-tests	6m 31s
unit-tests (windows-latest, 3.10) / unit-tests	6m 32s
unit-tests (windows-latest, 3.11) / unit-tests	10m 19s
unit-tests (windows-latest, 3.12) / unit-tests	11m 41s
	50m 40s

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