Guard against unset resolved_archive_file (#35628)
* archive_file may not be specified
When loading a pre-trained model from a gguf file, resolved_archive_file may not be set. Guard against that case in the safetensors availability check.
* Remap partial disk offload to cpu for GGUF files
GGUF files don't support disk offload so attempt to remap them to the CPU when device_map is auto. If device_map is anything else but None, raise a NotImplementedError.
* Don't remap auto device_map and raise RuntimeError
If device_map=auto and modules are selected for disk offload, don't attempt to map them to any other device. Raise a runtime error when a GGUF model is configured to map any modules to disk.
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Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>
