[new feature] Stepper: add input-width prop

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #3076 into dev will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             dev   #3076   +/-   ##
=====================================
  Coverage   89.8%   89.8%           
=====================================
  Files        107     107           
  Lines       2197    2197           
  Branches     197     197           
=====================================
  Hits        1973    1973           
  Misses       193     193           
  Partials      31      31

Impacted Files	Coverage Δ
packages/stepper/index.js	85.36% <ø> (ø)	⬆️

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