feat: add sort-attrs (fixes #92)

[yeonjuan]

#92

[codecov]

Codecov Report

Merging #162 (09c68a6) into main (221b048) will increase coverage by 0.08%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   98.18%   98.27%   +0.08%     
==========================================
  Files          46       47       +1     
  Lines        1045     1099      +54     
  Branches      274      282       +8     
==========================================
+ Hits         1026     1080      +54     
  Misses         19       19              

Flag	Coverage Δ
unittest	98.27% <100.00%> (+0.08%)	⬆️

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Files	Coverage Δ
packages/eslint-plugin/lib/rules/index.js	100.00% <100.00%> (ø)
packages/eslint-plugin/lib/rules/sort-attrs.js	100.00% <100.00%> (ø)