feat: sources import with new URL

[cap-Bernardito]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

Sources import with new URL

Breaking Changes

Asset modules replaces file-loader and url-loader

Additional Info

Use with mini-css-extract-plugin >= v1.6.0

[codecov]

Codecov Report

Merging #1297 (a220b5d) into next (899a4e3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             next    #1297   +/-   ##
=======================================
  Coverage   98.22%   98.22%           
=======================================
  Files          11       11           
  Lines         843      845    +2     
  Branches      283      285    +2     
=======================================
+ Hits          828      830    +2     
  Misses         12       12           
  Partials        3        3           

Impacted Files	Coverage Δ
src/index.js	100.00% <ø> (ø)
src/plugins/postcss-icss-parser.js	100.00% <ø> (ø)
src/plugins/postcss-import-parser.js	100.00% <ø> (ø)
src/plugins/postcss-url-parser.js	97.63% <ø> (ø)
src/runtime/getUrl.js	100.00% <100.00%> (ø)
src/utils.js	97.17% <100.00%> (+0.01%)	⬆️

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