Convert MusicLDM (#4579)
* from audioldm
* fix vae
* move to new pipeline
* copied from audioldm
* remove redundant control flow
* iterate
* fix docstring
* finish pipeline
* tests: from audioldm2
* iterate
* finish fast tests
* finish slow integration tests
* add docs
* remove dtype test
* update toctree
* "copied from" in conversion (where possible)
* Update docs/source/en/api/pipelines/musicldm.md
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
* fix docstring
* make nightly
* style
* fix dtype test
---------
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
