MXFP4/MXFP8 evaluation

[yiliu30]

Add support with below priority

• MXFP4 MOE [1/N] Initial vllm-ext evaluation support (MXFP4 MOE) #935
• MXFP4 Linear
• MXFP8 Lineaar
• MXFP8 MOE
• Docs