Composites delete information. #564
Description
Current Problem
Information is unnecessarily deleted by Composites.
In particular the info field of the sampleset can be deleted, despite containing useful information that could be sensibly propagated, such as QPU access time. Note that, if is not sufficient to return info from the bottom level of a Composites hierarchy only, info can be created at many levels.
Proposed Solution
dwavesystems/dwave-preprocessing#147 ; for all composites
Maintain the info field of the child solver if its interpretation is unambiguous.
Alternatives Considered
Additional context
Add any other context here.