perf(ui/inpuit): add class

[jiechen66]

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 #377 (c6a42ea) into dev (eadf910) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #377   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files         209      209           
  Lines        4910     4913    +3     
  Branches     1036     1027    -9     
=======================================
+ Hits         4733     4736    +3     
  Misses        177      177           

Impacted Files	Coverage Δ
packages/varlet-ui/src/form/Form.vue	100.00% <100.00%> (ø)
packages/varlet-ui/src/input/Input.vue	100.00% <100.00%> (ø)

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