diffusers

daebee09 - Add xformers attention to VAE (#1507)

Add xformers attention to VAE (#1507) * Add xformers attention to VAE * Simplify VAE xformers code * Update src/diffusers/models/attention.py Co-authored-by: Ilmari Heikkinen <ilmari@fhtr.org> Co-authored-by: Suraj Patil <surajp815@gmail.com>