[kernels][blackwell] add cutlass/cute group gemm forward for blackwell #1327
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This PR adds:
1 - the base GroupGemmKernel from Cutlass 4.0 cute dsl
2 - a CutlassGroupGemm Strategy that runs it with Deepseek model
3 - a converter class that handles PyTorch->Cute conversion as well as GroupGemm specific Cute preparation.
4 - updates model.py to add it as an available group gemm.