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

[Oleksandr Alex Zinenko via llvm-commits]

ftynse wrote:

IMO, transform interfaces belong to `lib/Interface`, and I wanted from the early days. Putting them there resolves dialect dependency problems. As for discussion about the place of transform dialect in the infrastructure, I'm happy to have it when people are ready to start taking these ideas seriously.

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