Choose 'png' image compression in BqplotImageView by default #458

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	19s
no_coverage / Load tox environments	3s
tests / Load tox environments	8s
no_coverage / py39-notebooks (windows-latest)	2m 32s
no_coverage / py38-notebooks (macos-12)	2m 18s
no_coverage / py310-notebooks (ubuntu-latest)	1m 32s
no_coverage / py311-docs (ubuntu-latest)	1m 24s
no_coverage / py39-docs (macos-12)	4m 43s
no_coverage / py38-docs (windows-latest)	2m 52s
tests / py38-test (ubuntu-latest)	1m 54s
tests / py39-test (ubuntu-latest)	1m 51s
tests / py310-test (ubuntu-latest)	2m 0s
tests / py311-test (ubuntu-latest)	1m 54s
tests / py38-test (macos-12)	2m 45s
tests / py39-test (macos-12)	3m 12s
tests / py311-test (macos-latest)	1m 34s
tests / py38-test (windows-latest)	5m 3s
tests / py39-test (windows-latest)	3m 6s
tests / py310-test (windows-latest)	2m 45s
publish / Build source and wheel distribution	3m 29s
	45m 28s

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