Return v1 and v2 calo objects in `make_calo`

Update make_calo to return both v1 and v2 calo objects. So far we were only returning v1 objects but both are created by the reconstruction (v1 are obtained from v2 with transformers). This is more explicit and allows downstream algorithms (monitors, checkers and particle makers) to use directly v2 objects as well.

Needed for #267 (closed) FYI @rmwillia

No changes to references expected