Add Parcel Plugin

[realplatanopapi]

Summary

I recently published a Parcel plugin for SVGR to npm, and was asked to make it a part of this repo instead. So here we are.

Test plan

I tested the plugin locally in a project I'm working on, and I added some tests.

[vercel]

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[codecov]

Codecov Report

Merging #235 into master will decrease coverage by 0.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #235      +/-   ##
==========================================
- Coverage   85.43%   85.26%   -0.17%     
==========================================
  Files          29       30       +1     
  Lines         453      448       -5     
  Branches      127      125       -2     
==========================================
- Hits          387      382       -5     
  Misses         55       55              
  Partials       11       11

Impacted Files	Coverage Δ
packages/parcel-plugin-svgr/src/asset.js	100% <100%> (ø)
packages/parcel-plugin-svgr/src/index.js	100% <100%> (ø)
packages/rollup/src/index.js	100% <100%> (ø)	⬆️
packages/webpack/src/index.js	94.73% <100%> (-0.92%)	⬇️
babel.config.js

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[gregberge]

@restlessbit it looks great! I will merge it tomorrow!

[realplatanopapi]

@neoziro Awesome! Let me know if you need me to make any changes ✨

[gregberge]

Thanks for your work @restlessbit 🎉