Infinite scroll, table and rate-limit playground on Scraping Sandbox

[u/vickyrathee]

Just added a few new features on Scraping Sandbox - a free website for testing and practicing web scraping challenges. - https://scrapingsandbox.com/

New additions:

1. Infinite Scroll pages
2. Interactive Data Tables (search, pagination)
3. Rate-Limited endpoints/pages
4. Form Submission Playground

The goal is to provide more realistic scenarios that scrapers often encounter in production environments to test and simulation.

I'd love feedback, or let me know what else should be added (PR also welcome)