Replace requests/aiohttp with httpx

[orangetin]

Is your feature request related to a problem? Please describe.
httpx is a modern http client library that provides sync and async libraries.

Describe the solution you'd like

1. Simplify the code used for sync/async by replacing requests/aiohttp with httpx
2. Enable http2 by default and have a configurable option to disable it
3. [Optional] Add support for proxies

Describe alternatives you've considered
N/A

Additional context
Relevant code that needs to be changed lives in this file.

[Ousret]

Hello there,

Would you consider Niquests as a potential replacement candidate ? It's a drop-in replacement for Requests with both sync and async interfaces along other features.
Happy to help if needed.

Regards,