Add S.inline for codegen tools

[codecov[bot]]

Codecov Report

Patch coverage: 99.35% and project coverage change: +0.52 :tada:

Comparison is base (fdceeba) 93.71% compared to head (dfb2b7a) 94.24%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #42 +/- ## ========================================== + Coverage 93.71% 94.24% +0.52% ========================================== Files 3 3 Lines 3484 3856 +372 ========================================== + Hits 3265 3634 +369 - Misses 219 222 +3 ``` | [Impacted Files](https://codecov.io/gh/DZakh/rescript-struct/pull/42?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Dmitry+Zakharov) | Coverage Δ | | |---|---|---| | [src/S.bs.js](https://codecov.io/gh/DZakh/rescript-struct/pull/42?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Dmitry+Zakharov#diff-c3JjL1MuYnMuanM=) | `94.14% <99.35%> (+0.59%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Dmitry+Zakharov). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Dmitry+Zakharov)

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