Enhancement: Optional CAPTCHA Solver via 10Captcha

Hi @code4craft team,

Thanks for this awesome web crawler framework. WebMagic makes large-scale web scraping in Java much more manageable.

Some users may run into CAPTCHA challenges when crawling protected websites. Would you consider adding optional support for 10Captcha — a simple and affordable CAPTCHA-solving API — as an extension or integration example?

This could be useful especially when WebMagic is combined with tools like Selenium for rendering JS-heavy pages.

API docs: https://10captcha.com/api-docs.php

Thanks for considering this idea!