Add ChromaInpaintPipeline

[hameerabbasi]

What does this PR do?

Adds a ChromaInpaintPipeline

Fixes #12572

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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cc @yiyixuxu and @asomoza

[hameerabbasi]

cc @DN6 A review would be appreciated.