feat: BlockEncoder#encode and BlockDecoder#decode can be async #175

Job	Run time
js-test-and-release / check	49s
js-test-and-release / test-node (windows-latest, lts/*)	2m 20s
js-test-and-release / test-node (ubuntu-latest, lts/*)	16s
js-test-and-release / test-chrome	27s
js-test-and-release / test-chrome-webworker	28s
js-test-and-release / test-node (macos-latest, lts/*)	1m 23s
js-test-and-release / test-firefox	20s
js-test-and-release / test-electron-renderer	16s
js-test-and-release / test-firefox-webworker	29s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	15s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	15s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 27s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 9s
js-test-and-release / test-electron-main	27s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	10m 21s

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