Add initial GPU implementation of Non-Max Suppression (NMS) #5600
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This PR introduces the first GPU-accelerated implementation of Non-Max Suppression (NMS) within the max/kernels/src/nn module. This implementation runs NMS per thread for each (batch, class) pair, matching the functional behavior of the CPU version. This version focuses on functional correctness and establishing the GPU execution framework. Performance optimizations will be added in follow-up PRs.