Add and document an [examples] extra requirement #2422

Job	Run time
Documentation style	18s
Code style	3m 17s
Documentation build	5m 50s
Tests and coverage (ubuntu-latest, 3.9)	15m 56s
Test with lower-bound dependency versions	8m 32s
Tests and coverage (ubuntu-latest, 3.10)	16m 4s
Tests and coverage (ubuntu-latest, 3.11)	21m 30s
Tests and coverage (ubuntu-latest, 3.12)	21m 49s
Build package	18s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.9)	1m 11s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.10)	1m 0s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.11)	56s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.12)	1m 13s
Build wheelhouse for latest Python versions (windows-latest, 3.9)	3m 8s
Build wheelhouse for latest Python versions (windows-latest, 3.10)	3m 11s
Build wheelhouse for latest Python versions (windows-latest, 3.11)	2m 21s
Build wheelhouse for latest Python versions (windows-latest, 3.12)	3m 6s
Release project	0s
Deploy development documentation	0s
Deploy stable documentation	0s
	1h 49m 40s

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