[mlir][transform] Add multi-buffering to the transform dialect

Add the plumbing necessary to call the memref dialect's multiBuffer
function. This will allow separation between choosing which buffers
to multi-buffer and the actual transform.

Alter the multibuffer function to return the newly created
allocation if multi-buffering succeeds. This is necessary to
communicate with the transform dialect hooks what allocation
multi-buffering created.

Reviewed By: ftynse, nicolasvasilache

Differential Revision: https://reviews.llvm.org/D133985