[mlir][utils] Add script to verify canonicalizations against Alive2 (#91867)

This script takes IR before and after canonicalization, translates it
into llvm IR and converts it to format suitable for Alive2
https://alive2.llvm.org/ce/

This is primarily for arith canonicalizations verification, but
technically it can be adapted for any dialect translatable to llvm.

Usage `python verify_canon.py canonicalize.mlir -f func1 func2 ...`

Example output: https://alive2.llvm.org/ce/z/KhQs4J

Initial discussion:
https://github.com/llvm/llvm-project/pull/91646#pullrequestreview-2049342826