Add entry points for viewer registry #354

Job	Run time
initial_checks / Load tox environments	6s
initial_checks / codestyle (ubuntu-latest)	17s
no_coverage / Load tox environments	8s
tests / Load tox environments	8s
no_coverage / py39-notebooks (windows-latest)	3m 16s
no_coverage / py38-notebooks (macos-latest)	3m 22s
no_coverage / py310-notebooks (ubuntu-latest)	1m 37s
no_coverage / py311-docs (ubuntu-latest)	1m 32s
no_coverage / py39-docs (macos-latest)	3m 34s
no_coverage / py38-docs (windows-latest)	2m 48s
tests / py38-test (ubuntu-latest)	2m 3s
tests / py39-test (ubuntu-latest)	2m 5s
tests / py310-test (ubuntu-latest)	2m 10s
tests / py311-test (ubuntu-latest)	2m 3s
tests / py38-test (macos-latest)	3m 58s
tests / py39-test (macos-latest)	3m 57s
tests / py311-test (macos-latest)	2m 49s
tests / py38-test (windows-latest)	3m 19s
tests / py39-test (windows-latest)	3m 33s
tests / py310-test (windows-latest)	3m 24s
publish / Build source and wheel distribution	58s
	47m 7s

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