Add spinitron API functions. #11613

Job	Run time
build_js	1m 10s
build_details	2s
build_opam (4.14.x)	52s
build_opam (5.2.x)	54s
build_no_depopts	57s
build_win32 (x64)	42s
build_posix (debian_trixie, amd64)	42s
lezer_parse	53s
build_posix (debian_bookworm, amd64)	43s
build_posix (ubuntu_oracular, amd64)	43s
run_tests (@citest)	42s
tree_sitter_parse	49s
run_tests (@doctest)	41s
build_posix (ubuntu_noble, amd64)	41s
update_doc	0s
run_tests (@mediatest)	42s
build_posix (alpine, amd64)	43s
fetch_s3_artifacts	1s
build_docker_alpine_minimal	1s
build_docker_alpine	1s
build_docker	1s
build_docker_minimal	1s
build_docker_release	1s
build_docker_release-minimal	1s
update_release	1s
	12m 4s

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