feat: support to config overlay inner style

[AshoneA]

ref: ant-design/ant-design#23155

要做自定义得支持下 style

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[codecov]

Codecov Report

Merging #213 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #213   +/-   ##
=======================================
  Coverage   88.00%   88.00%           
=======================================
  Files           3        3           
  Lines          25       25           
  Branches       10       10           
=======================================
  Hits           22       22           
  Misses          3        3           

Impacted Files	Coverage Δ
src/Tooltip.tsx	83.33% <ø> (ø)
src/Content.tsx	100.00% <100.00%> (ø)

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[AshoneA]

@afc163 @zombieJ 帮忙看下合下

[zombieJ]

这个名字有点蛋疼，和 overlayStyle 挺像。似乎也省不掉。到 antd 里记得把它 omit 掉，免得别人用了。

[zombieJ]

另外，加个 test case 和备注，连到 antd issue 里。

[AshoneA]

这个名字有点蛋疼

三大难问题之命名难

加个 test case 和备注，连到 antd issue 里。

OK

[AshoneA]

@zombieJ check it!

[zombieJ]

+ [email protected]