ComfyUI installer should also install Triton, SageAttention, and FlashAttention accelerators

### Feature Idea

The ComfyUI installer (for Windows / Mac) is supposed to make getting started easy, right?

The process for a novice ComfyUI user to install Triton, SageAttention, and FlashAttention in an existing ComfyUI installation is quite complicated (and evolving... given ongoing updates to PyTorch, CUDA, and these libraries themselves).

It would be wonderful to have this all taken care of by your installer! These accelerators are now in widespread amongst the ComfyUI community.

### Existing Solutions

Use a GPT to try get the correct instructions for these installs, customized to:

- OS version
- Python and PyTorch version
- CUDA version
- GPU
- etc.

... or trawl through Reddit discussions hoping to find mention of a similar

### Other

_No response_