feat: collect interop into single subpackage

[nstarman]

Better organization.

[codecov[bot]]

Codecov Report

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

Project coverage is 89.54%. Comparing base (0eca81c) to head (d8c86c6).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #136 +/- ## ========================================== + Coverage 89.52% 89.54% +0.02% ========================================== Files 24 25 +1 Lines 1308 1311 +3 ========================================== + Hits 1171 1174 +3 Misses 137 137 ```

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