Functional tests

Add doc support of lambda parameters and return value for cpp,swift,dart #4326

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Run time

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Job	Run time
C++	2m 33s
Dart	3m 45s
Android	8m 34s
CMake toolchain tests	7m 54s
Dart with AddressSanitizer	3m 25s
Swift on Linux	5m 11s
Swift on MacOS	8m 22s
	39m 44s