feat(gpu): add circulant matrix for one vs many poly product #2030
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To support encrypted GLWE x clear matrix product, all polys of the GLWE are multiplied with the clear matrix. For each poly of the GLWE, this PR builds a circulant matrix that is multiplied with the clear matrix to obtain the polynomial product. Sample N of this product contains the matrix product of the original clear vector that was encrypted and the clear matrix.