5-argument mul! has different signature than in stdlib #19
Description
In MKLSparse, the 5-argument mul! has a signature mul!(α, A, B, β, C) while in LinearAlgebra (and SparseArrays) it is mul!(C, A, B, α, β) (since Julia v1.3). MKLSparse should adopt the same LinearAlgebra API in order to allow third-party code to work with one or other library without changes.
CC: @fernandopenaranda, who noticed this