Feature: 支持 WebSocket 连接同时获取 str 或 bytes

[yanyongyu]

resolve #950

[github-actions]

🚀 Deployed on https://deploy-preview-962--nonebot2.netlify.app

[codecov]

Codecov Report

Merging #962 (fbc6754) into master (a776642) will increase coverage by 0.14%.
The diff coverage is 68.18%.

@@            Coverage Diff             @@
##           master     #962      +/-   ##
==========================================
+ Coverage   77.29%   77.44%   +0.14%     
==========================================
  Files          42       42              
  Lines        3096     3125      +29     
==========================================
+ Hits         2393     2420      +27     
- Misses        703      705       +2     

Flag	Coverage Δ
unittests	77.44% <68.18%> (+0.14%)	⬆️

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Impacted Files	Coverage Δ
nonebot/drivers/httpx.py	69.23% <ø> (ø)
nonebot/drivers/aiohttp.py	44.56% <30.00%> (-0.79%)	⬇️
nonebot/drivers/websockets.py	65.06% <60.00%> (-0.33%)	⬇️
nonebot/drivers/fastapi.py	87.33% <81.81%> (+<0.01%)	⬆️
nonebot/internal/driver/model.py	65.18% <83.33%> (+0.84%)	⬆️
nonebot/drivers/quart.py	88.02% <100.00%> (+3.24%)	⬆️
nonebot/exception.py	79.54% <0.00%> (+4.54%)	⬆️

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