(Batch)PointGet's exec details should expose the key size and network bytes

## Enhancement
This needs to modify the client-go to make it return the needed things.

Start by locating the client-go implementation and entry point for BatchPointGet execution details, then inspect how the current details are assembled and exposed. Add the key size and network bytes to that result and run the relevant client-go tests; done means both values are available to callers.

Written by the indexing model from the issue text.