WIP tpp-opt pipelines-as-schedules via python

[rolfmorel]

E.g.

(echo "module {"; cat ../test/Integration/matmul_48x64x96.mlir; echo "}"; bin/tpp-opt.py) | bin/tpp-opt -load-tpp-dialects -transform-interpreter

If we want to use the transform-interpreter as a pass, we need load-tpp-dialects due to upstream brokenness (approach taking to this is inline with Discourse suggestion: https://discourse.llvm.org/t/dynamic-pass-scheduling-and-dialect-loading/85166/2).