[llvm] [mlir] [mlir] Move InlinerInterface from Transforms to Interfaces. (PR #84878)

[Oleksandr Alex Zinenko via llvm-commits]

ftynse wrote:

I haven't checked how big are these libraries, but maybe we want to introduce a level of hierarchy under `Transform`, so there is `lib/Transform/Inliner`, `lib/Transform/Tiling, `lib/Transform/Loops` that can come with both the interfaces and the transforms that rely on those.

https://github.com/llvm/llvm-project/pull/84878