fix: add option to export non-extended unixfs (#438) #396

Job	Run time
js-test-and-release / build	1m 15s
js-test-and-release / check	1m 6s
js-test-and-release / test-chrome	1m 13s
js-test-and-release / test-firefox	1m 23s
js-test-and-release / test-electron-main	19s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 51s
js-test-and-release / test-node (ubuntu-latest, lts/*)	56s
js-test-and-release / test-node (macos-latest, lts/*)	2m 3s
js-test-and-release / test-firefox-webworker	16s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	56s
js-test-and-release / test-chrome-webworker	16s
js-test-and-release / test-electron-renderer	22s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 35s
js-test-and-release / test-node (windows-latest, lts/*)	3m 14s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 20s
js-test-and-release / release-check	2s
js-test-and-release / release	1m 3s
	19m 10s

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