[mlir][Vector] Add ExtractOp folding when fed by a TransposeOp

TransposeOp are often followed by ExtractOp.
In certain cases however, it is unnecessary (and even detrimental) to lower a TransposeOp to either a flat transpose (llvm.matrix intrinsics) or to unrolled scalar insert / extract chains.

Providing foldings of ExtractOp mitigates some of the unnecessary complexity.

Differential revision: https://reviews.llvm.org/D83487