Dart CI

Merge `coverage` package #3

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Run time

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Job	Run time
analyze (dev)	19s
test (ubuntu-latest, 3.4)	1m 35s
test (ubuntu-latest, dev)	1m 41s
test (macos-latest, 3.4)	1m 31s
test (macos-latest, dev)	1m 38s
test (windows-latest, dev)	1m 55s
coverage	1m 43s
	10m 22s