perf(ui/steps): add class

[startgain]

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[codecov-commenter]

Codecov Report

Merging #378 (17d4943) into dev (6b40718) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #378   +/-   ##
=======================================
  Coverage   96.39%   96.40%           
=======================================
  Files         209      209           
  Lines        4915     4922    +7     
  Branches     1034     1032    -2     
=======================================
+ Hits         4738     4745    +7     
  Misses        177      177           

Impacted Files	Coverage Δ
packages/varlet-ui/src/steps/Steps.vue	100.00% <100.00%> (ø)
packages/varlet-ui/src/icon/Icon.vue	100.00% <0.00%> (ø)
packages/varlet-ui/src/image/Image.vue	100.00% <0.00%> (ø)

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