feat: Add Badge component and update Badge/Alert variants

[kylealwyn]

BREAKING CHANGE: the variants hash will require an update to scope variants by their associated components

[codecov-io]

Codecov Report

Merging #13 into master will increase coverage by 1.42%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   72.78%   74.21%   +1.42%     
==========================================
  Files          11       13       +2     
  Lines         147      159      +12     
  Branches       24       24              
==========================================
+ Hits          107      118      +11     
- Misses         29       30       +1     
  Partials       11       11

Impacted Files	Coverage Δ
src/Button/Button.js	66.66% <ø> (ø)	⬆️
src/utils.js	100% <100%> (ø)	⬆️
src/theme.js	100% <100%> (ø)	⬆️
src/Badge/Badge.js	100% <100%> (ø)
src/Flex/Flex.js	75% <0%> (ø)

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