[new feature] Slider: add active-color、inactive-color prop

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #2374 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #2374      +/-   ##
==========================================
+ Coverage   85.65%   85.65%   +<.01%     
==========================================
  Files         100      100              
  Lines        1791     1792       +1     
  Branches      370      370              
==========================================
+ Hits         1534     1535       +1     
  Misses        197      197              
  Partials       60       60

Impacted Files	Coverage Δ
packages/slider/index.vue	100% <100%> (ø)	⬆️

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