feat(svgo): add .svgorc.js config file support

[kuoruan]

Summary

#412 add any SVGO config format support but missing .svgorc.js

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[codecov]

Codecov Report

Merging #451 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #451   +/-   ##
=======================================
  Coverage   86.60%   86.60%           
=======================================
  Files          31       31           
  Lines         560      560           
  Branches      155      155           
=======================================
  Hits          485      485           
  Misses         60       60           
  Partials       15       15           

Impacted Files	Coverage Δ
packages/plugin-svgo/src/index.js	66.66% <ø> (ø)

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