[core] AnimateDiff SparseCtrl (#8897)
* initial sparse control model draft
* remove unnecessary implementation
* copy animatediff pipeline
* remove deprecated callbacks
* update
* update pipeline implementation progress
* make style
* make fix-copies
* update progress
* add partially working pipeline
* remove debug prints
* add model docs
* dummy objects
* improve motion lora conversion script
* fix bugs
* update docstrings
* remove unnecessary model params; docs
* address review comment
* add copied from to zero_module
* copy animatediff test
* add fast tests
* update docs
* update
* update pipeline docs
* fix expected slice values
* fix license
* remove get_down_block usage
* remove temporal_double_self_attention from get_down_block
* update
* update docs with org and documentation images
* make from_unet work in sparsecontrolnetmodel
* add latest freeinit test from #8969
* make fix-copies
* LoraLoaderMixin -> StableDiffsuionLoraLoaderMixin
