refactor: BaseInput

[MadCcc]

• affix-wrapper 上添加 ${prefix}-disabled className，简化使用
• 完全废弃 classes，所有属性移到 classNames 下
• 废弃 inputElement，使用 children 代替
• className style 和 hidden 属性现在会在最后附加到返回的元素上，移除复杂的判断逻辑
• 一些 BaseInput 的结构优化

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d75e44d) 96.80% compared to head (447ae1d) 96.72%.
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   96.80%   96.72%   -0.09%     
==========================================
  Files           5        5              
  Lines         188      183       -5     
  Branches       72       69       -3     
==========================================
- Hits          182      177       -5     
  Misses          6        6              

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