Safetensors loading in "convert_diffusers_to_original_stable_diffusion" (#2054)
* Safetensors loading in "convert_diffusers_to_original_stable_diffusion"
Adds diffusers format saftetensors loading support
* Fix import sort order: convert_diffusers_to_original_stable_diffusion.py
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>