🚀 Feature: Use `Intl.Segmenter` when available

### Bug Report Checklist - [x] I have tried restarting my IDE and the issue persists. - [x] I have pulled the latest `main` branch of the repository. - [x] I have [searched for related issues](https://github.com/JoshuaKGoldberg/sentences-per-line/issues?q=is%3Aissue) and found none that matched my issue. ### Overview ```ts const segmenter = new Intl.Segmenter(undefined, { granularity: 'sentence' }) ``` ### Additional Info _No response_