Build: Teach build system to build Doxygen docs #2441

Job	Run time
Build deps [ubuntu]	5s
Build [macosx_arm64]	10m 24s
Documentation	15s
Shellcheck	4s
Docker [ubuntu]	21m 58s
UT [c++]	22m 50s
Build [ubuntu]	15m 38s
UT [python]	16s
IT [single/legacy_mode]	3m 1s
IT [multi/legacy_mode]	15m 43s
Build Prometheus plugin [ubuntu]	9m 33s
Fuzz test [identity]	1m 26s
IT [single/fsm_mode]	3m 8s
Fuzz test [open_queue]	7m 47s
IT [multi/fsm_mode]	11m 11s
Fuzz test [configure_queue_stream]	4m 36s
Fuzz test [put]	2m 41s
Fuzz test [confirm]	3m 30s
Fuzz test [close_queue]	17m 13s
Fuzz test [disconnect]	1m 54s
	2h 33m 13s

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