feat(input): add --input-label-font-size css var (#209)

[kiaking]

close #209

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[codecov]

Codecov Report

Base: 69.52% // Head: 69.72% // Increases project coverage by +0.20% 🎉

Coverage data is based on head (ac615c9) compared to base (b06e66f).
Patch coverage: 98.87% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   69.52%   69.72%   +0.20%     
==========================================
  Files         106      106              
  Lines        8797     8859      +62     
  Branches      367      368       +1     
==========================================
+ Hits         6116     6177      +61     
- Misses       2681     2682       +1     

Impacted Files	Coverage Δ
lib/components/SInputText.vue	98.03% <98.71%> (+0.04%)	⬆️
lib/components/SInputBase.vue	100.00% <100.00%> (ø)
lib/components/SInputNumber.vue	100.00% <100.00%> (ø)

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