refactor: Use rc-util to mini final antd dist size

[zombieJ]

• 使用 rc-util 库的 useMergedState 做状态管理
• 移除 autoFocus 相关代码（使用原生逻辑实现）
• 移除 onMouseUp 调用的 blur 使之更符合无障碍规范
• 提升覆盖率到 100%
• 为 Not correct animations ant-design/ant-design#24087 做准备

cc @hengkx

[codecov]

Codecov Report

Merging #49 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #49   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           43        24   -19     
  Branches        12         5    -7     
=========================================
- Hits            43        24   -19     

Impacted Files	Coverage Δ
src/index.tsx	100.00% <100.00%> (ø)

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[zombieJ]

我发个 minor 版本，配合去修 ant-design/ant-design#24087