fix: reduce dagPb and dagCbor handler complexity #121

Job	Run time
js-test-and-release / check	2m 28s
js-test-and-release / test-electron-main	37s
js-test-and-release / test-electron-renderer	23s
js-test-and-release / test-chrome-webworker	48s
js-test-and-release / test-chrome	49s
js-test-and-release / test-firefox	40s
js-test-and-release / test-firefox-webworker	38s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	57s
js-test-and-release / test-node (windows-latest, lts/*)	4m 3s
js-test-and-release / test-webkit (macos-latest, lts/*)	4m 49s
js-test-and-release / test-node (ubuntu-latest, lts/*)	40s
js-test-and-release / test-node (macos-latest, lts/*)	3m 6s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	47s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	4m 5s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	24m 50s

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