feat: add titleEllipsis api

[MrHeer]

close ant-design/ant-design#23267

[vercel]

This pull request is being automatically deployed with ZEIT Now (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://zeit.co/react-component/tree/aon0xo964
✅ Preview: https://tree-git-fork-mrheer-tree-title-ellipsis.react-component.now.sh

[codecov]

Codecov Report

Merging #313 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #313      +/-   ##
==========================================
- Coverage   99.60%   99.60%   -0.01%     
==========================================
  Files          10       10              
  Lines        1011     1009       -2     
  Branches      288      288              
==========================================
- Hits         1007     1005       -2     
  Misses          4        4              

Impacted Files	Coverage Δ
src/Tree.tsx	99.46% <ø> (ø)
src/NodeList.tsx	100.00% <100.00%> (ø)
src/TreeNode.tsx	100.00% <100.00%> (ø)

---

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 4b4a351...ffa18de. Read the comment docs.