Add entry points for viewer registry #352

Job	Run time
initial_checks / Load tox environments	4s
initial_checks / codestyle (ubuntu-latest)	21s
tests / Load tox environments	5s
no_coverage / Load tox environments	4s
no_coverage / py39-notebooks (windows-latest)	3m 20s
no_coverage / py38-notebooks (macos-latest)	3m 13s
no_coverage / py310-notebooks (ubuntu-latest)	1m 39s
no_coverage / py311-docs (ubuntu-latest)	1m 34s
no_coverage / py39-docs (macos-latest)	2m 59s
no_coverage / py38-docs (windows-latest)	2m 56s
tests / py38-test (ubuntu-latest)	1m 58s
tests / py39-test (ubuntu-latest)	2m 8s
tests / py310-test (ubuntu-latest)	1m 59s
tests / py311-test (ubuntu-latest)	2m 10s
tests / py38-test (macos-latest)	3m 38s
tests / py39-test (macos-latest)	3m 52s
tests / py311-test (macos-latest)	3m 35s
tests / py38-test (windows-latest)	3m 53s
tests / py39-test (windows-latest)	3m 27s
tests / py310-test (windows-latest)	3m 45s
publish / Build source and wheel distribution	1m 6s
	47m 46s

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