feat: RangePicker dateRender support additional info

[zombieJ]

做成了一个 object 免得未来还有需要拓展。另外帮忙看一下名字：

export type RangeDateRender<DateType> = (
  currentDate: DateType,
  today: DateType,
  info: {
    range: 'start' | 'end';
  },
) => React.ReactNode;

position 在内部是双面板时区分左右用的，免得未来拓展搞迷糊就没用这个名字用了 range，帮忙看看有没有更好的命名。

ref: ant-design/ant-design#24124 (comment)

[codecov]

Codecov Report

Merging #74 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   99.55%   99.55%           
=======================================
  Files          43       43           
  Lines        1788     1793    +5     
  Branches      531      534    +3     
=======================================
+ Hits         1780     1785    +5     
  Misses          6        6           
  Partials        2        2           

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

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[shaodahong]

我一开始的想法也是扩展成对象，不然后面扩展拉面条一样，命名 range 可以