Add and document an [examples] extra requirement #2419

Job	Run time
Code style	3m 0s
Documentation build	6m 3s
Documentation style	17s
Test with lower-bound dependency versions	8m 12s
Tests and coverage (ubuntu-latest, 3.9)	16m 1s
Tests and coverage (ubuntu-latest, 3.10)	21m 5s
Tests and coverage (ubuntu-latest, 3.11)	33m 24s
Tests and coverage (ubuntu-latest, 3.12)	34m 20s
Build package	17s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.9)	1m 1s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.10)	58s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.11)	1m 3s
Build wheelhouse for latest Python versions (ubuntu-latest, 3.12)	1m 3s
Build wheelhouse for latest Python versions (windows-latest, 3.9)	3m 2s
Build wheelhouse for latest Python versions (windows-latest, 3.10)	3m 3s
Build wheelhouse for latest Python versions (windows-latest, 3.11)	3m 22s
Build wheelhouse for latest Python versions (windows-latest, 3.12)	2m 39s
Release project	0s
Deploy development documentation	0s
Deploy stable documentation	0s
	2h 18m 50s

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