适配 Discord 适配器

[AzideCupric]

在 #69 的基础上进一步适配并修改测试代码

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[codecov]

Codecov Report

Attention: Patch coverage is 98.47328% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.88%. Comparing base (d7b7b94) to head (c393b3a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
nonebot_plugin_saa/adapters/discord.py	98.36%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   95.72%   95.88%   +0.15%     
==========================================
  Files          26       27       +1     
  Lines        2151     2282     +131     
==========================================
+ Hits         2059     2188     +129     
- Misses         92       94       +2     

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[felinae98]

@AzideCupric /rebase

[AzideCupric]

@AzideCupric /rebase

Done.