feat: Support mentions

[zombieJ]

ref:

• Daparated Mention integration with draft.js ant-design/ant-design#14542
• Mention 组件不加前后空格 ant-design/ant-design#15694
• Mention 组件 safari 变量前无法输入 ant-design/ant-design#15656
• onBlur fired on controlled Mention component when selecting an item from a list using click ant-design/ant-design#13309

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[afc163]

ant-design/ant-design#15694

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@3db4afd). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #1   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?      7           
  Lines             ?    239           
  Branches          ?     47           
=======================================
  Hits              ?    239           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
src/DropdownMenu.tsx	100% <100%> (ø)
src/Option.tsx	100% <100%> (ø)
src/KeywordTrigger.tsx	100% <100%> (ø)
src/MentionsContext.ts	100% <100%> (ø)
src/Mentions.tsx	100% <100%> (ø)
src/util.ts	100% <100%> (ø)

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[chenshuai2144]

loading 好评。
list 最好能默认给一个，不然每次自己写也很麻烦