[Refactor] Switch to ComfyUI LTS

[iwr-redmond]

You may wish to consider switching from ComfyUI main to ComfyUI LTS, which is pip/uv installable.

The LTS version includes GGUF support as standard, and provides the option of adding a pip-installable version of Nunchaku in the future. LTS releases are also versioned, making dependency management somewhat easier.

Switching would primarily involve removing the custom Git loader code and adding something like:

# set the release
comfy_release = "0.3.66.10"

# installation
run_pip(f'install comfyui@git+https://github.com/hiddenswitch/ComfyUI.git@v{comfy_release}')

However, some modules have been reorganized and the RF pipeline might also require modifications.

[iwr-redmond]

As of 0.6.0, ComfyUI has begun dropping support for versions of Torch before 2.4. However, the LTS version has added support Torch 2.2 and 2.3 back in.

Related upstream issue: torchruntime#25