[mlir][memref] Add initial Wide Int Emulation pass and patterns

Add a new pass and conversions to emulate wide integer operations over memrefs.
The emulation is implemented on top of the existing pass to emulate wide integer arith ops.

Improve naming in the arith pass to avoid potential name clashes.

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D135722