[Pipeline] Add TextToVideoZeroPipeline (#2954)
* add TextToVideoZeroPipeline and CrossFrameAttnProcessor
* add docs for text-to-video zero
* add teaser image for text-to-video zero docs
* Fix review changes. Add Documentation. Add test
* clean up the codes in pipeline_text_to_video.py. Add descriptive comments and docstrings
* make style && make quality
* make fix-copies
* make requested changes to docs. use huggingface server links for resources, delete res folder
* make style && make quality && make fix-copies
* make style && make quality
* Apply suggestions from code review
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
