Remove conversion to RGB (#6479)
* Remove conversion to RGB
* Add a Conversion Function
* Add type hint for convert_method
* Update src/diffusers/utils/loading_utils.py
Update docstring
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
* Update docstring
* Optimize imports
* Optimize imports (2)
* Reformat code
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Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
