feat(cli): make all CLI options available in config

[gregberge]

Related #431, #437

Summary

All CLI options can now be defined in .svgrrc.

Test plan

[vercel]

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🔍 Inspect: https://vercel.com/gregberge/svgr/2bsu6ipzy
✅ Preview: https://svgr-git-cli-options-in-config.gregberge.now.sh

[codecov]

Codecov Report

Merging #445 into master will not change coverage.
The diff coverage is 94.73%.

@@           Coverage Diff           @@
##           master     #445   +/-   ##
=======================================
  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/webpack/src/index.js	95.45% <66.66%> (ø)
...ckages/babel-plugin-add-jsx-attribute/src/index.js	100.00% <100.00%> (ø)
...ges/babel-plugin-remove-jsx-attribute/src/index.js	100.00% <100.00%> (ø)
...ckages/babel-plugin-svg-dynamic-title/src/index.js	100.00% <100.00%> (ø)
...ckages/babel-plugin-svg-em-dimensions/src/index.js	93.75% <100.00%> (ø)
...bel-plugin-transform-react-native-svg/src/index.js	97.72% <100.00%> (ø)
packages/babel-preset/src/index.js	93.54% <100.00%> (ø)
packages/core/src/config.js	100.00% <100.00%> (ø)
packages/hast-util-to-babel-ast/src/all.js	100.00% <100.00%> (ø)
...ckages/hast-util-to-babel-ast/src/getAttributes.js	90.00% <100.00%> (ø)
... and 2 more

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