refactor: make utility packages internal

[codecov-commenter]

Codecov Report

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

Comparison is base (37f935d) 95.27% compared to head (3719f52) 95.27%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #108 +/- ## ======================================= Coverage 95.27% 95.27% ======================================= Files 12 12 Lines 529 529 ======================================= Hits 504 504 Misses 25 25 ```

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