Migrate to esbuild #91

Job	Run time
build	1m 17s
lint	1m 28s
integration-tests (18, ubuntu, chromium)	6h 0m 13s
integration-tests (18, ubuntu, firefox)	6h 0m 13s
integration-tests (18, windows, chromium)	6h 0m 0s
integration-tests (18, windows, firefox)	5h 59m 59s
unit-tests (16, ubuntu)	42s
unit-tests (16, macos)	54s
unit-tests (16, windows)	29s
unit-tests (18, ubuntu)	1s
unit-tests (18, macos)	1s
unit-tests (18, windows)	1s
	1d 0h 5m 18s

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