Consider supporting `Guest.resume()` - re-starting the instance

[pvalena]

Would it make sense to have resume() in API, to re-start some instance? For long running VMs / restarts f,e,? IOW opposite of stop() method.

_Originally posted by @pvalena in https://github.com/render_node/MDIzOlB1bGxSZXF1ZXN0UmV2aWV3VGhyZWFkMjgzMTkxMDM3OnYy/pull_request_review_threads/discussion