refactor: `namedExport` option is enabled by default

[cap-Bernardito]

This PR contains a:

• [ ] bugfix
• [ ] new feature
• [x] code refactor
• [x] test update
• [ ] typo fix
• [x] metadata update

Motivation / Use-Case

namedExport option is enabled by default

Breaking Changes

When the namedExport option is enabled there are restrictions in the naming of css classes. More in readmy

Additional Info

No

[codecov[bot]]

Codecov Report

Merging #1304 (75044a1) into next (13b7458) will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             next    #1304      +/-   ##
==========================================
+ Coverage   98.22%   98.31%   +0.08%     
==========================================
  Files          11       11              
  Lines         844      889      +45     
  Branches      283      298      +15     
==========================================
+ Hits          829      874      +45     
  Misses         12       12              
  Partials        3        3              

Impacted Files	Coverage Δ
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/index.js	100.00% <100.00%> (ø)
src/runtime/getUrl.js	100.00% <100.00%> (ø)
src/utils.js	97.45% <100.00%> (+0.30%)	:arrow_up:

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