feat(exp): rename `*utils` package to `*util`

[jooola]

Use a smaller and clearer package name.

[codecov[bot]]

Codecov Report

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

Project coverage is 71.56%. Comparing base (f7ac563) to head (21936cf).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #487 +/- ## ======================================= Coverage 71.56% 71.56% ======================================= Files 45 45 Lines 3903 3903 ======================================= Hits 2793 2793 Misses 696 696 Partials 414 414 ```

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