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Adds 'flask' sub-command #1459

Job	Run time
test-jupyter	10m 49s
prerelease-test	1m 42s
Integration tests against latest Connect	4m 30s
test (py3.7 ubuntu-latest)	1m 56s
test (py3.8 ubuntu-latest)	1m 36s
test (py3.9 ubuntu-latest)	1m 53s
test (py3.10 ubuntu-latest)	1m 32s
test (py3.11 ubuntu-latest)	1m 59s
test (py3.9 macos-latest)	2m 22s
test (py3.9 windows-latest)	5m 30s
distributions	1m 16s
docs	1m 12s
dispatch	0s
	36m 17s

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