common: support remote preset (#18520)

* arg: support remote preset

* proof reading

* allow one HF repo to point to multiple HF repos

* docs: mention about multiple GGUF use case

* correct clean_file_name

* download: also return HTTP status code

* fix case with cache file used

* fix --offline option

common/download.h

@@ -65,6 +65,14 @@ bool common_download_model(
 // returns list of cached models
 std::vector<common_cached_model_info> common_list_cached_models();
 
+// download single file from url to local path
+// returns status code or -1 on error
+int common_download_file_single(const std::string & url,
+                                const std::string & path,
+                                const std::string & bearer_token,
+                                bool offline,
+                                const common_header_list & headers = {});
+
 // resolve and download model from Docker registry
 // return local path to downloaded model file
 std::string common_docker_resolve_model(const std::string & docker);