Add operations & framework for plan translation

[Nolski]

Plan translation using threepio adds operations to Role which allows us to store multiple Action lists for each framework. It also adds base_framework to Plan which indicates which framework Plan.actions is targeting.

https://github.com/OpenMined/PySyft/pull/3371 is blocking on this PR

[Nolski]

@karlhigley This PR should have breaking changes (changing Role.actions) but it looks like the breaking changes test passes? Is that okay?

[karlhigley]

@Nolski Known issue: https://github.com/OpenMined/syft-proto/issues/91