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Compress marshalled .odoc/.odocl payloads

Route the marshalling in Odoc_file through the compiler's own Compression
module (compiler-libs.common, already a dependency), the same mechanism it
uses for .cmt/.cmti. Payloads are compressed when the compiler was built
with zstd support and fall back to plain Marshal otherwise.

The version-dependent shim lives in Odoc_model.Compat, which is already
cppo-processed for both the OCaml version and OxCaml, so no new generated
module is needed.

Add a marker in the magic that states whether compression is being used.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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