add from_single_file to animatediff (#10924)
* Update pipeline_animatediff.py
* Update pipeline_animatediff_controlnet.py
* Update pipeline_animatediff_sparsectrl.py
* Update pipeline_animatediff_video2video.py
* Update pipeline_animatediff_video2video_controlnet.py
---------
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>
