Add generic thread queues, use them to implement autocue-specific que… #11593

Job	Run time
build_details	4s
build_js	2m 4s
build_opam (4.14.x)	8m 45s
build_opam (5.2.x)	5m 9s
lezer_parse	53s
tree_sitter_parse	51s
build_no_depopts	5m 35s
build_posix (debian_trixie, amd64)	13m 8s
build_win32 (x64)	17m 41s
build_posix (debian_bookworm, amd64)	14m 32s
run_tests (@citest)	12m 39s
update_doc	11m 9s
build_posix (ubuntu_oracular, amd64)	16m 15s
run_tests (@doctest)	8m 19s
build_posix (ubuntu_noble, amd64)	14m 14s
run_tests (@mediatest)	12m 11s
build_posix (alpine, amd64)	11m 49s
fetch_s3_artifacts	22s
build_docker_minimal (amd64)	2m 9s
build_docker_alpine_minimal (amd64)	49s
build_docker (amd64)	2m 34s
build_docker_alpine (amd64)	54s
update_release	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 42m 6s

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