Add semi-additive categories infrastructure #3915

Job	Run time
quick-build (latest, ubuntu-latest)	3m 27s
quick-build (supported, ubuntu-latest)	3m 30s
quick-build (dev, ubuntu-latest)	3m 23s
nix	2m 14s
build (supported)	3m 41s
opam-build (supported, ubuntu-latest)	4m 45s
build (latest)	3m 32s
opam-build (latest, ubuntu-latest)	4m 45s
build (dev, --warnings)	3m 52s
opam-build (dev, ubuntu-latest)	4m 19s
doc-dep-graphs	7m 51s
doc-alectryon	12m 31s
doc-coqdoc	1m 45s
install (latest)	1m 50s
doc-timing	1m 51s
install (dev)	1m 51s
install (supported)	1m 58s
coqchk (dev)	1m 45s
coqchk (latest)	1m 56s
coqchk (supported)	2m 3s
delete-artifacts	10s
deploy-doc	1s
	1h 13m 0s

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