Add reconvert command to merge PVs into an existing Device

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.36%. Comparing base (9648c5b) to head (568cacf).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #126 +/- ## ========================================== + Coverage 89.78% 91.36% +1.57% ========================================== Files 23 23 Lines 1459 1471 +12 ========================================== + Hits 1310 1344 +34 + Misses 149 127 -22 ```

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