feat(Tabbar): add before-change prop

[chenjiahan]

#7062

[codecov-commenter]

Codecov Report

Merging #7081 into dev will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #7081      +/-   ##
==========================================
+ Coverage   91.27%   91.29%   +0.02%     
==========================================
  Files         176      177       +1     
  Lines        4743     4754      +11     
  Branches      280      284       +4     
==========================================
+ Hits         4329     4340      +11     
  Misses        378      378              
  Partials       36       36              

Impacted Files	Coverage Δ
src/tabbar/index.js	94.11% <100.00%> (+0.36%)	⬆️
src/utils/interceptor.ts	100.00% <100.00%> (ø)

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