StealthyFetcher

`StealthyFetcher` is a stealthy browser-based fetcher similar to [DynamicFetcher](dynamic.md), using [Playwright's API](https://playwright.dev/python/docs/intro). It adds advanced anti-bot protection bypass capabilities, most handled automatically. It shares the same browser automation model as `DynamicFetcher`, using [Playwright's Page API](https://playwright.dev/python/docs/api/class-page) for page interaction.