Update pipeline_animatediff_controlnet.py add from_single_file support for AnimateDiffControlNetPipeline

[chaowenguo]

What does this PR do?

Fixes # (issue)

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@hlky

[hlky]

Can you share a single file checkpoint for this pipeline for testing?

[chaowenguo]

https://huggingface.co/chaowenguo/pal/blob/main/chilloutMix-Ni.safetensors @hlky

[chaowenguo]

@hlky when can you review and merge the pr?

[hlky]

What are these additional changes?

[chaowenguo]

@hlky could you just focus on commit a115001, addtional change still not working

[hlky]

@chaowenguo The PR should be for one feature