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

[Stella Laurenzo via llvm-commits]

stellaraccident wrote:

> I am speaking from the point of view of how the core team built MLIR, none of MLIR would exist with this kind of criteria. Some may want to see a different project management, but that’s a change, that is not how MLIR has been and is driven by the maintainers of the Core infra.

We are at a different point now vs 5 years ago. And even then, history is much more nuanced than this. I was there too. Anyway...

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