[mlir][Transforms][NFC] Improve builder/listener API of OperationFolder

The constructor of `OperationFolder` takes a listener. Therefore, the remaining API should not take any builder/rewriters. This could lead to double notifications in case a listener is attached to the builder/rewriter.

As an internal cleanup, `OperationFolder` now has an `IRRewriter` instead of a `RewriterBase::Listener`. In most cases, `OperationFolder` no longer has to notify/deal with listeners. This is done by the rewriter.

Differential Revision: https://reviews.llvm.org/D146134