Missing mlir-opt options in onnx-mlir-opt

[doru1004]

Just noticed today that we are missing some mlir-opt options in onnx-mlir-opt. This issue is a reminder to register some of the missing mlir-opt passes in onnx-mlir-opt.

[doru1004]

@AlexandreEichenberger if you have any more passes which you'd like see in onnx-mlir-opt please enumerate them here and I will try to add them!

[AlexandreEichenberger]

Actually yes:

--convert-vector-to-scf --lower-affine --convert-scf-to-std --convert-vector-to-llvm

generally, everything that has vector, affine, scf