feat: support count

[zombieJ]

ref react-component/input#47 ant-design/ant-design#37733

[codecov]

Codecov Report

Merging #47 (84b1c8c) into master (3f95e2e) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

❗ Current head 84b1c8c differs from pull request most recent head 177a0f1. Consider uploading reports for the commit 177a0f1 to get more accurate results

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
- Coverage   99.06%   98.98%   -0.08%     
==========================================
  Files           3        3              
  Lines         214      198      -16     
  Branches       63       55       -8     
==========================================
- Hits          212      196      -16     
  Misses          2        2              

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

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