feat: add base45 multibase #194

Job	Run time
js-test-and-release / check	1m 1s
js-test-and-release / test-electron-main	39s
js-test-and-release / test-chrome	33s
js-test-and-release / test-electron-renderer	17s
js-test-and-release / test-chrome-webworker	34s
js-test-and-release / test-firefox	25s
js-test-and-release / test-firefox-webworker	37s
js-test-and-release / test-node (windows-latest, lts/*)	2m 13s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	1m 24s
js-test-and-release / test-node (ubuntu-latest, lts/*)	40s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 27s
js-test-and-release / test-node (macos-latest, lts/*)	1m 14s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 15s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 18s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	13m 37s

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