AnimateDiff prompt travel (#9231)
* update
* implement prompt interpolation
* make style
* resnet memory optimizations
* more memory optimizations; todo: refactor
* update
* update animatediff controlnet with latest changes
* refactor chunked inference changes
* remove print statements
* undo memory optimization changes
* update docstrings
* fix tests
* fix pia tests
* apply suggestions from review
* add tests
* update comment
