switch to single ref #60
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This PR changes the entire logic and move to using a single ref everywhere.
The benefits and drawbacks should be analyzed and discussed. A clear benefit is that it is easier to reason about and removes the use of the patched dask task wrapper which has caused difficulties in the past to maintain already. In this way we rely on pure ray and dask concepts and only introduce infra on top of it for distributed scheduling.
The drawback is that perhaps we lose an abstraction level that might be needed later?
To be discussed.