Migrate cryptocurrency.py to use pydantic models

[codecov[bot]]

Codecov Report

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

Project coverage is 83.88%. Comparing base (a6092ef) to head (9445248).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #691 +/- ## ========================================== - Coverage 83.97% 83.88% -0.10% ========================================== Files 282 282 Lines 20490 20333 -157 Branches 3148 3122 -26 ========================================== - Hits 17207 17056 -151 + Misses 2957 2956 -1 + Partials 326 321 -5 ```

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