[llvm] [mlir] [mlir] split transform interfaces into a separate library (PR #85221)

[Stella Laurenzo via llvm-commits]

stellaraccident wrote:

This is edging into a pointless discussion. Alex: happy to meet f2f and help parse my collected experiences with TD and talk through paths. It's always hard to tell, but I think my team may be one of the heaviest users of it, and if you're not getting feedback, we can fix that. Ditto for PDL fwiw.

Mehdi: you're forgetting one key person. @lattner and I discussed MLIR principles every week and much of that is embedded into how things unfolded.

https://github.com/llvm/llvm-project/pull/85221