[CUDA] Make qmv support global scale#3723
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qqmmreroutes toqmvwhen M=1, while the latter did not support global scales. This PR fixes it for CUDA backend, and it should be trivial to implement in Metal and CPU later if this is the right approach.Another thing we can do is to add global scale support to
qmmgenerally, not necessarily as a public API but as a fallback forqqmmwhen there is no native nvfp4 kernels, for example for Metal backend and for sm80/sm90 in CUDA backend.