feat(Tabs): add before-change prop

[chenjiahan]

#6685

[codecov-commenter]

Codecov Report

Merging #6817 into dev will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #6817      +/-   ##
==========================================
+ Coverage   91.39%   91.47%   +0.08%     
==========================================
  Files         175      175              
  Lines        4707     4717      +10     
  Branches      279      279              
==========================================
+ Hits         4302     4315      +13     
+ Misses        369      368       -1     
+ Partials       36       34       -2     

Impacted Files	Coverage Δ
src/tabs/index.js	82.64% <100.00%> (+1.56%)	⬆️
src/tabs/utils.ts	76.19% <0.00%> (+14.28%)	⬆️

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