Implement hybrid sampler #79
Description
Implement a minimizer that does N steps using a (cheap) oracle and then accept/reject the whole change based on a more complex oracle. Note that because of this, the two oracles might need to take different energy terms (because, for example, the cheap oracle cannot evaluate all of them). In practice, you might need to have 2 systems, which effectively only share the chains but not the energy terms, and keep swapping between them.