feat(Steps): add click-step event

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #5937 into dev will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #5937   +/-   ##
=======================================
  Coverage   91.31%   91.31%           
=======================================
  Files         164      164           
  Lines        4305     4306    +1     
  Branches      298      298           
=======================================
+ Hits         3931     3932    +1     
  Misses        332      332           
  Partials       42       42           

Impacted Files	Coverage Δ
src/step/index.js	100.00% <100.00%> (ø)

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