Broadcasting for ewBinary codegen

[AlexRTer]

This PR changes the existing ewBinaryOp codegen to broadcast rhs if possible. So far, the ewBinary codegen only accepted scalars, matrices of equal shape or combinations of lhs being a matrix and rhs being either a scalar or singleton. Now rhs can also be given as a matching (equal to lhs in one dimension and size 1 in the other) row or column vector.

An example script (--explain mlir_codegen is optional to show the generated IR):

// RUN: ./bin/daphne --select-matrix-repr --mlir-codegen --explain mlir_codegen ./fileName.daphne

lhsMat = [1, 2, 3, 4, 5, 6](2,);

rhsMat = [10, 20, 30, 40, 50, 60](2,);
rhsRowMat = [10, 20, 30](1,);
rhsColMat = [10, 20](,1);
rhsScalar = 10;
rhsSingleton = [10];

print(lhsMat + rhsMat);
print(lhsMat + rhsRowMat);
print(lhsMat + rhsColMat);
print(lhsMat + rhsScalar);
print(lhsMat + rhsSingleton); // not supported outside of codegen yet

A more thorough description will be given once some tests have been added.