Implement framewise encoding/decoding in LTX Video VAE (#10488)
* add framewise decode
* add framewise encode, refactor tiled encode/decode
* add sanity test tiling for ltx
* run make style
* Update src/diffusers/models/autoencoders/autoencoder_kl_ltx.py
Co-authored-by: Aryan <contact.aryanvs@gmail.com>
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Co-authored-by: Pham Hong Vinh <vinhph3@vng.com.vn>
Co-authored-by: Aryan <contact.aryanvs@gmail.com>