refactor: unify HTTP request library to httpx

[awwaawwa]

The current project's network requests include requests and urllib, among others. Among these, urllib's API is not particularly user-friendly; requests do not support async. encode/httpx: A next generation HTTP client for Python. 🦋 - GitHub natively provides async/sync APIs, and its API is similar to requests, offering better usability.

[reycn]

The download operation currently blocks subsequent steps, so I don't see the necessity for it. However, contributions are welcome.

[awwaawwa]

Mainly, when calling some translation APIs, HTTP requests need to be sent, and currently, requests is being used for that part, so I'm thinking of unifying everything to async when I get to it, since there aren't many anyway.