Add Qwen3.5 MoE#862

Goekdeniz-Guelmez wants to merge 8 commits intoml-explore:mainml-explore/mlx-lm:mainfrom

Goekdeniz-Guelmez:add-qwen3.5-moeGoekdeniz-Guelmez/mlx-lm:add-qwen3.5-moeCopy head branch name to clipboard