chore: Add more accessibility data

[zombieJ]

看了一下，当年 Menu 基于 Lighthouse 打分做了一下 aria 标签，但是并没有真的连起来。找个时间两个组件一同整理一下。

ref https://github.com/react-component/menu/pull/137

[codecov[bot]]

Codecov Report

Merging #101 into master will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #101      +/-   ##
==========================================
+ Coverage   98.57%   98.70%   +0.12%     
==========================================
  Files           2        2              
  Lines          70       77       +7     
  Branches       24       24              
==========================================
+ Hits           69       76       +7     
  Misses          1        1              

Impacted Files	Coverage Δ
src/Dropdown.tsx	98.64% <100.00%> (+0.14%)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e1c415b...d86972d. Read the comment docs.

[afc163]

https://github.com/ant-design/ant-design/runs/691739740

https://github.com/ant-design/ant-design/suites/698853523/artifacts/6703648

lighthourse 里针对 a11y 也有很多扣分项，可以一并解决一下。

[afc163]

冲突了