feat: add validFor function to return the validity interval #346

Job	Run time
js-test-and-release / build	30s
js-test-and-release / check	18s
js-test-and-release / test-chrome	23s
js-test-and-release / test-node (ubuntu-latest, lts/*)	27s
js-test-and-release / test-node (windows-latest, lts/*)	2m 16s
js-test-and-release / test-node (macos-latest, lts/*)	1m 1s
js-test-and-release / test-chrome-webworker	22s
js-test-and-release / test-firefox-webworker	25s
js-test-and-release / test-firefox	24s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 7s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	51s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 15s
js-test-and-release / test-electron-renderer	25s
js-test-and-release / test-webkit (macos-latest, lts/*)	42s
js-test-and-release / test-electron-main	22s
js-test-and-release / release-check	-1s
js-test-and-release / release	0s
	10m 47s

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