perf(ui/row): add class

[ahqrt]

Checklist

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• Fix linting errors
• Tests have been added / updated (or snapshots)

Change information

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[github-actions]

[codecov-commenter]

Codecov Report

Merging #384 (2e634d6) into dev (3e472dd) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #384   +/-   ##
=======================================
  Coverage   96.40%   96.41%           
=======================================
  Files         209      209           
  Lines        4929     4931    +2     
  Branches     1005     1005           
=======================================
+ Hits         4752     4754    +2     
  Misses        177      177           

Impacted Files	Coverage Δ
packages/varlet-ui/src/row/Row.vue	100.00% <100.00%> (ø)

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