Add spinitron API functions. (#4158) #11616

Job	Run time
build_opam (4.14.x)	8m 46s
build_js	2m 10s
build_details	3s
build_opam (5.2.x)	5m 2s
build_no_depopts	5m 51s
build_win32 (x64)	17m 15s
lezer_parse	56s
build_posix (debian_trixie, amd64)	13m 57s
run_tests (@citest)	12m 27s
build_posix (debian_bookworm, amd64)	13m 46s
run_tests (@doctest)	7m 44s
build_posix (ubuntu_oracular, amd64)	15m 44s
tree_sitter_parse	52s
update_doc	11m 31s
run_tests (@mediatest)	12m 30s
build_posix (ubuntu_noble, amd64)	13m 48s
build_posix (alpine, amd64)	11m 23s
fetch_s3_artifacts	29s
build_docker_alpine (amd64)	1m 2s
build_docker (amd64)	3m 10s
build_docker_alpine_minimal (amd64)	1m 32s
build_docker_minimal (amd64)	2m 22s
update_release	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 42m 20s

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