fix: use ipfs-unixfs-exporter directly #110

Job	Run time
js-test-and-release / check	2m 40s
js-test-and-release / test-chrome	1m 0s
js-test-and-release / test-chrome-webworker	54s
js-test-and-release / test-node (windows-latest, lts/*)	3m 46s
js-test-and-release / test-firefox	51s
js-test-and-release / test-node (ubuntu-latest, lts/*)	39s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	48s
js-test-and-release / test-node (macos-latest, lts/*)	5m 14s
js-test-and-release / test-webkit (macos-latest, lts/*)	2m 55s
js-test-and-release / test-firefox-webworker	46s
js-test-and-release / test-electron-main	46s
js-test-and-release / test-electron-renderer	33s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	40s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	2m 56s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	24m 28s

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