Add local bubble B field examples #238

Job	Run time
initial_checks / Load tox environments	5s
initial_checks / codestyle (ubuntu-latest)	24s
deploy-examples	29s
tests / Load tox environments	6s
tests / py39-test-all (ubuntu-latest)	3m 37s
tests / py310-test-all (ubuntu-latest)	4m 41s
tests / py311-test-all (ubuntu-latest)	3m 26s
tests / py312-test-all (ubuntu-latest)	3m 42s
tests / py312-test-qt (ubuntu-latest)	3m 11s
tests / py312-test-jupyter (ubuntu-latest)	4m 20s
tests / py39-test-all (macos-13)	9m 15s
tests / py310-test-all (macos-latest)	4m 51s
tests / py311-test-all (macos-latest)	4m 34s
tests / py312-test-all (macos-latest)	5m 3s
tests / py312-test-qt (macos-latest)	4m 55s
tests / py39-test-all (windows-latest)	6m 48s
tests / py310-test-all (windows-latest)	7m 21s
tests / py311-test-all (windows-latest)	6m 35s
tests / py312-test-all (windows-latest)	7m 10s
tests / py312-test-qt (windows-latest)	6m 24s
tests / py312-test-jupyter (windows-latest)	5m 55s
	1h 32m 52s

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