fix: add option to export non-extended unixfs #395

Job	Run time
js-test-and-release / build	1m 23s
js-test-and-release / check	1m 1s
js-test-and-release / test-node (macos-latest, lts/*)	2m 23s
js-test-and-release / test-node (ubuntu-latest, lts/*)	53s
js-test-and-release / test-node (windows-latest, lts/*)	3m 30s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 24s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 16s
js-test-and-release / test-electron-renderer	26s
js-test-and-release / test-electron-main	24s
js-test-and-release / test-chrome	1m 5s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 30s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 2s
js-test-and-release / test-firefox	1m 19s
js-test-and-release / test-chrome-webworker	18s
js-test-and-release / test-firefox-webworker	20s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	18m 14s

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