feat: allow momentum coords in to_Vector*D methods + cleanup

[Saransh-cpp]

Description

Fixes #382

Paves the way for #422 (make the conversions more user-friendly)

cc: @nsmith-, @iasonkrom, @lgray

Checklist

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[codecov[bot]]

Codecov Report

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

Project coverage is 82.92%. Comparing base (e4c3f53) to head (b12df12).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #423 +/- ## ========================================== + Coverage 82.87% 82.92% +0.05% ========================================== Files 96 96 Lines 11533 11533 ========================================== + Hits 9558 9564 +6 + Misses 1975 1969 -6 ```

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