feat: add unit-* props to SInputText and SInputNumber

[NozomuIkuta]

I added unit-before and unit-after props to SInputText and SInputNumber.

Additionally, I modified Histoire's story controls for us to test UI interactively.

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[codecov]

Codecov Report

Base: 69.52% // Head: 69.78% // Increases project coverage by +0.26% 🎉

Coverage data is based on head (0270c89) compared to base (b06e66f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #210      +/-   ##
==========================================
+ Coverage   69.52%   69.78%   +0.26%     
==========================================
  Files         106      106              
  Lines        8797     8874      +77     
  Branches      367      368       +1     
==========================================
+ Hits         6116     6193      +77     
  Misses       2681     2681              

Impacted Files	Coverage Δ
lib/components/SInputNumber.vue	100.00% <100.00%> (ø)
lib/components/SInputText.vue	98.29% <100.00%> (+0.31%)	⬆️

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[kiaking]

Woot woot 🙌