* tests: allow exporting graph ops from HF file without downloading weights
* use unique_ptr for llama_context in HF metadata case
* fix missing non-required tensors falling back to type f32
* use unique pointers where possible
* use no_alloc instead of fixing f32 fallback
* fix missing space
* Add model metadata loading from huggingface for use with other tests
* Add incremental chunking instead of full redownload, fix caching issue and add warning when it fails
* Add support for split models, load metadata from each individual split file, also avoid mmproj
* Code cleanup, revert incremental downloading
* Only compile when cpp-httplib has SSL support
* Fix formatting
Ruben Ortlam