Feature: 添加 State 响应器触发消息注入

[A-kirami]

No description provided.

[github-actions]

🚀 Deployed on https://deploy-preview-1315--nonebot2.netlify.app

[codecov]

Codecov Report

Merging #1315 (82db00f) into master (ab227ee) will increase coverage by 0.11%.
The diff coverage is 95.91%.

@@            Coverage Diff             @@
##           master    #1315      +/-   ##
==========================================
+ Coverage   85.88%   86.00%   +0.11%     
==========================================
  Files          41       41              
  Lines        3174     3215      +41     
==========================================
+ Hits         2726     2765      +39     
- Misses        448      450       +2     

Flag	Coverage Δ
unittests	86.00% <95.91%> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
nonebot/rule.py	97.76% <92.00%> (-0.65%)	⬇️
nonebot/consts.py	100.00% <100.00%> (ø)
nonebot/params.py	100.00% <100.00%> (ø)

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[yanyongyu]

在state里不能用一个key，会出现覆盖的情况，比如rule为startswith("xxx") & endswith("xxx")

[A-kirami]

在state里不能用一个key，会出现覆盖的情况，比如rule为startswith("xxx") & endswith("xxx")

忘了这种情况，那还是分别设置key比较好