feat(exp): add sliceutil package

[jooola]

• Adds a Batches utility to split slices into batches.

[codecov[bot]]

Codecov Report

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

Project coverage is 71.57%. Comparing base (8313c91) to head (4e43235).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #489 +/- ## ========================================== + Coverage 71.54% 71.57% +0.02% ========================================== Files 45 46 +1 Lines 3901 3905 +4 ========================================== + Hits 2791 2795 +4 Misses 696 696 Partials 414 414 ```

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[apricote]

Opps. I went on a journey, and it looks like this functionality is already merged in Go stdlib and will be released with 1.23: https://go-review.googlesource.com/c/go/+/562935

[jooola]

Nice, we will be to replace this utility with the std lib once we dropped go 1.22