Include `mmcv`s in requirements and update versions

[jhj0517]

Changed:

1. Include mmcvs in requirements
2. Update torch versions with CUDA 12.1
3. Install different decord on MacOS.
   • https://github.com/TMElyralab/Comfyui-MusePose/pull/25
4. Update xformers to latest compatible version
5. Update README to reflect changes.

Tested with

python pose_align.py --imgfn_refer ./assets/images/ref.png --vidfn ./assets/videos/dance.mp4
python test_stage_2.py --config ./configs/test_stage_2.yaml -W 512 -H 512

in venv and confirmed that it works fine.