Unofficial keyauth rust library

i decided to upgrade the official keyauth library to the latest api (1.2) just cus.

TODO

• [x] init
• [x] register
• [x] upgrade
• [x] login
• [x] license
• [ ] fetchOnline
• [x] setvar (user)
• [x] getvar (user)
• [x] var
• [x] checkblacklist
• [ ] chatget
• [ ] chatsend
• [x] log
• [x] webhook
• [ ] ban
• [x] file (download)
• [ ] check (session)

maybe will be ported from c++ - [ ] weblogin

note

A lot of code is from the official rust library the reason this exists is because the official rust library uses api version 1.0 which i was told by wn#0111 is much slower https://davidon.top/i/kBEBwkm