Add a tutorial on mlir-opt (#96105)
This tutorial gives an introduction to the `mlir-opt` tool, focusing on
how to run basic passes with and without options, run pass pipelines
from the CLI, and point out particularly useful flags.
---------
Co-authored-by: Jeremy Kun <j2kun@users.noreply.github.com>
Co-authored-by: Mehdi Amini <joker.eph@gmail.com>
