[LTX2] LTX2 Video VAE implementation#346
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This PR adds Video VAE component for LTX-2. This implementation ensures numerical and shapes parity with the reference PyTorch/Diffusers logic.
New files added:
autoencoder_kl_ltx2.py: Video VAE component for LTX2test_video_vae_ltx2.py: unittests for Video VAE