Implement Hashset

[WilliamTakeshi]

Hello!

First of all, thank you for the project. I discovered it through a Reddit post and was really interested in seeing how the implementation came together. I decided to start with the HashSet issue #5 since it looked like the most straightforward to start.

In the HashSet all the methods are the same as HashMap, except for the ones I removed and one that I renamed for clarity.

Please feel free to suggest any changes or give feedback—I’m open to it!

Thanks for your time!

Removed methods:

• compute
• get_key_value
• get_or_insert
• get_or_insert_with
• keys
• remove_entry
• try_insert
• update
• update_or_insert
• update_or_insert_with
• values

Renamed:

• contains_key -> contains

[WilliamTakeshi]

I fixed cargo fmt and the check for 1.72

But I will probably need help with the mac stress and the errors here: https://github.com/ibraheemdev/papaya/actions/runs/11555441048/job/32448555759

I don't know what I changed that broke both :(

[ibraheemdev]

This looks amazing, thanks!

Both of those CI errors look unrelated. The macOS stress test failure is a spurious stack overflow that I've been seeing occasionally, I suspect it's just due to the lower default stack size on macOS rather than an infinite recursion error, as the tests are intentionally quite intensive.

The other error is very odd, I'm not sure what's causing it. I'll take a look.