feat: add server timing to responses #474

Job	Run time
js-test-and-release / check	1m 54s
js-test-and-release / test-chrome-webworker	1m 3s
js-test-and-release / test-node (windows-latest, lts/*)	1m 45s
js-test-and-release / test-node (ubuntu-latest, lts/*)	38s
js-test-and-release / test-firefox	43s
js-test-and-release / test-chrome	58s
js-test-and-release / test-node (macos-latest, lts/*)	1m 48s
js-test-and-release / test-electron-main	41s
js-test-and-release / test-firefox-webworker	42s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	55s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	58s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 41s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	1m 46s
js-test-and-release / test-electron-renderer	26s
js-test-and-release / release-check	1s
js-test-and-release / release	1s
	16m 0s

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