Add feature to allow dry-run for change plans

[rsafonseca]

No description provided.

[L30Bola]

I think that today our whole login is inside of the Reconcile method and this MR shows that. If we want to use the same logic "elsewhere" (in this case it is not elsewhere as we are implementing inside the Reconcile method but I think it should be elsewhere) we would need to copy/paste a lot, if not everything. We should add a TODO on our tasks to actually split the logic from Reconcile into a package (and maybe even more than one package) and Reconcile would only use the package methods and the dry-run itself should be elsewhere (maybe even another codebase/program).

This won't be easy, as I was discussing with @rafatio and he said: "it's not easy to join some of the logic inside a single package". So, yeah, I think that today it's okay the MR but we should do this split in the future.