onnxruntime

915a9990 - [WebGPU] Unify core implementations of GEMM and MatMul (#24586)

[WebGPU] Unify core implementations of GEMM and MatMul (#24586) ### Description This PR extract core implementations into gemm_utils.cc which is used to generate shader both GEMM and Matmul ops. The core implemenations included scalar and vec4 versions of GEMM and Matmul. ### Motivation and Context There are many common codes for GEMM and Matmul, so we want to extra common code to unify their implementations.  --------- Co-authored-by: Yulong Wang <7679871+fs-eire@users.noreply.github.com>