test: add gateway conformance tests #223

Job	Run time
js-test-and-release / check	2m 36s
js-test-and-release / test-chrome	47s
js-test-and-release / test-node (windows-latest, lts/*)	4m 27s
js-test-and-release / test-firefox	44s
js-test-and-release / test-node (ubuntu-latest, lts/*)	43s
js-test-and-release / test-chrome-webworker	42s
js-test-and-release / test-node (macos-latest, lts/*)	3m 59s
js-test-and-release / test-firefox-webworker	51s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	58s
js-test-and-release / test-electron-main	53s
js-test-and-release / test-webkit (macos-latest, lts/*)	3m 33s
js-test-and-release / test-electron-renderer	32s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	54s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	3m 21s
js-test-and-release / release-check	0s
js-test-and-release / release	0s
	25m 0s

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