Choose 'png' image compression in BqplotImageView by default #455

Job	Run time
initial_checks / Load tox environments	7s
initial_checks / codestyle (ubuntu-latest)	21s
tests / Load tox environments	6s
no_coverage / Load tox environments	3s
no_coverage / py39-notebooks (windows-latest)	2m 49s
no_coverage / py38-notebooks (macos-12)	2m 14s
no_coverage / py310-notebooks (ubuntu-latest)	1m 33s
no_coverage / py311-docs (ubuntu-latest)	1m 15s
no_coverage / py39-docs (macos-12)	3m 59s
no_coverage / py38-docs (windows-latest)	2m 32s
tests / py38-test (ubuntu-latest)	2m 7s
tests / py39-test (ubuntu-latest)	2m 3s
tests / py310-test (ubuntu-latest)	1m 49s
tests / py311-test (ubuntu-latest)	1m 56s
tests / py38-test (macos-12)	2m 53s
tests / py39-test (macos-12)	3m 1s
tests / py311-test (macos-latest)	1m 36s
tests / py38-test (windows-latest)	3m 1s
tests / py39-test (windows-latest)	3m 0s
tests / py310-test (windows-latest)	2m 57s
publish / Build source and wheel distribution	3m 55s
	43m 17s

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