Feature: 命令匹配支持强制指定空白符

[yanyongyu]

fix #1743

[github-actions]

🚀 Deployed on https://deploy-preview-1748--nonebot2.netlify.app

[codecov]

Codecov Report

Merging #1748 (28b490b) into master (34223d6) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1748      +/-   ##
==========================================
+ Coverage   88.00%   88.06%   +0.06%     
==========================================
  Files          44       44              
  Lines        3342     3361      +19     
==========================================
+ Hits         2941     2960      +19     
  Misses        401      401              

Flag	Coverage Δ
unittests	88.06% <100.00%> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
nonebot/consts.py	100.00% <100.00%> (ø)
nonebot/params.py	100.00% <100.00%> (ø)
nonebot/plugin/on.py	99.38% <100.00%> (ø)
nonebot/rule.py	97.56% <100.00%> (+0.11%)	⬆️

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