Release the v2.0 version of MotionLCM

MotionLCM v2.0

• [Feature]: Support the training of VAE and MLD.
• [Feature]: Improve compression rate for multi-latent-token diffusion.
• [Feature]: Support consistency latent tuning for motion control.

What's Changed

• [Bump] MotionLCM-V2 by @Dai-Wenxun in #20

Full Changelog: v1.0...v2.0