Add support for native xml parsing. #11949

Job	Run time
build_opam (4.14.x)	9m 23s
build_js	2m 12s
build_details	5s
build_opam (5.2.x)	5m 14s
build_no_depopts	6m 5s
tree_sitter_parse	47s
lezer_parse	47s
build_posix (debian_trixie, amd64)	15m 15s
run_tests (@citest)	12m 38s
build_win32 (x64)	4m 41s
build_posix (debian_trixie, arm64)	13m 43s
run_tests (@doctest)	8m 36s
update_doc	0s
build_posix (debian_bookworm, amd64)	13m 37s
run_tests (@mediatest)	12m 44s
build_posix (debian_bookworm, arm64)	12m 43s
build_posix (ubuntu_oracular, amd64)	15m 15s
build_posix (ubuntu_oracular, arm64)	12m 50s
build_posix (ubuntu_noble, amd64)	13m 39s
build_posix (ubuntu_noble, arm64)	12m 5s
build_posix (alpine, amd64)	9m 58s
build_posix (alpine, arm64)	8m 3s
fetch_s3_artifacts	20s
build_docker_minimal (amd64)	2m 8s
build_docker_alpine (amd64)	54s
build_docker_minimal (arm64)	2m 8s
build_docker (amd64)	2m 2s
update_release	0s
build_docker_alpine (arm64)	54s
build_docker (arm64)	2m 22s
build_docker_alpine_minimal (amd64)	49s
build_docker_alpine_minimal (arm64)	55s
build_docker_release-minimal	0s
build_docker_release	0s
	3h 22m 52s

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