feat: conversion between quantities

[codecov[bot]]

Codecov Report

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

Project coverage is 91.10%. Comparing base (fb74d80) to head (323dd50). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #162 +/- ## ========================================== + Coverage 90.98% 91.10% +0.12% ========================================== Files 31 32 +1 Lines 1553 1574 +21 ========================================== + Hits 1413 1434 +21 Misses 140 140 ```

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