Feature: Automatically pull sample data for Codeforces problem

[c650]

Have Veris detect that you're working on a Codeforces problem by:

• Java class name
• or, filepath. e.g., ~/Code/codeforces/817/E

Save (cache) samples in some temporary directory. Can be expanded to work on other platforms (like Kattis, etc).

Currently, my idea is just to do some web scraping, so extending it across websites would be a bit tedious, at best.

[tbuzzelli]

We could create an abstract class called SampleScraper that we can just do implementations of to scrape the data.