Add javadoc #7048

Job	Run time
test-utils-py	16s
test-utils-js	18s
setup	1s
full-build-base	3h 19m 6s
full-build-LTS	2h 47m 50s
base-build-mac	13m 58s
base-build-windows	7m 4s
bb-on-different-os (windows-latest)	26m 24s
debug	0s
bb-on-different-os (macos-latest)	1h 8m 59s
installer-for-debian	1m 19s
installer-for-windows	1m 50s
installer-for-osx	2m 19s
	8h 9m 24s

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