sd-controlnet-depth model for PPDiffusers

Thanks

https://huggingface.co/lllyasviel/ControlNet

for the implementation and the release of 1.5 models.

https://github.com/PaddlePaddle/PaddleNLP/tree/develop/ppdiffusers/scripts/convert_diffusers_model

for the conversion script to PPDiffusers