Add: Solution for forward proxy server

[chinmayagrawal775]

Added Solution to forward proxy server challenge. Link to challenge: https://codingchallenges.fyi/challenges/challenge-forward-proxy Link to solution: https://github.com/chinmayagrawal775/forward_proxy

Solution very slightly differs from actual challange. Like in chanllege, we have a step to restrict specific words. I have implemented it, but commented out that section for HTTPs request. Also added some extra things, like threadpooling, profiling server.

Might be added in future: Analytics DB, clickhouse or duckdb

Demo link: https://x.com/Chinmay_775/status/1836065734100726046

[JohnCrickett]

This needs to be linked from the main list too.