atdml: support normalize_jsonlike in module-based JSON adapters When <json adapter.ocaml="M"> is used, of_jsonlike now calls M.normalize_jsonlike before deserialization, mirroring the M.normalize call in of_yojson. The function name is intentionally different to avoid conflicts with the Yojson adapter interface. Only module-based adapters are supported for jsonlike; inline adapters (adapter.to_ocaml / adapter.from_ocaml) are not supported and continue to be silently skipped for the jsonlike path. Implementation: the mode record's supports_json_adapters:bool field is replaced with normalize_of_adapter:(json_adapter -> string option), so each mode knows how to derive its normalize expression from an adapter. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>