[mlir] Add option to read reproducer options from file

Add command line option to read the configuration dumped by the MLIR crash
reproducer and adds those to the other command line options parsed by mlir-opt.

Simple convenience that enables `mlir-opt --run-reproducer /tmp/repro.mlir`
instead of needing to copy&paste the configuration.

Differential Revision: https://reviews.llvm.org/D93924