Add CogVideoX DDIM Inversion to Community Pipelines

[LittleNyima]

What does this PR do?

Add CogVideoX DDIM inversion to community pipelines, as shown in the videos below.
This PR does the same thing as THUDM/CogVideo#709, which has been approved.

Inverse and reconstruct with an empty prompt:

414194624-48b4c9fe-38fb-4f24-872e-9c2fc35ea033.mp4

Inverse and reconstruct with an editing prompt:

414194983-e01e4b55-493c-4602-8f5c-ab2346cdfaa0.mp4

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

Who can review?

Anyone in the community is free to review the PR once the tests have passed. Feel free to tag
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@zRzRzRzRzRzRzR @a-r-r-o-w

[yiyixuxu]

thank you!

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.