feat: issue 1256

[cap-Bernardito]

This PR contains a:

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

Motivation / Use-Case

Fixes #1256
With the help of the /* webpackIgnore: true */comment, it is possible to disable sources handling for rules and for individual declarations.

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #1264 (9d6bf7e) into master (e18c5a9) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1264      +/-   ##
==========================================
+ Coverage   99.41%   99.46%   +0.04%     
==========================================
  Files          11       11              
  Lines         684      742      +58     
  Branches      221      248      +27     
==========================================
+ Hits          680      738      +58     
  Misses          4        4              

Impacted Files	Coverage Δ
src/plugins/postcss-import-parser.js	100.00% <100.00%> (ø)
src/plugins/postcss-url-parser.js	100.00% <100.00%> (ø)
src/utils.js	98.75% <100.00%> (+<0.01%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e18c5a9...43e91ee. Read the comment docs.