chore: warn when styleResources is used without the community module

[manniL]

related: #3994

As style-resources-loader causes huge performance problems and we cannot easily replace or remove it as it'd be a breaking change, we should put out a warning and a reference to the drop-in replacement (https://github.com/nuxt-community/style-resources-module).

The module will set build.styleResources to an empty object if used, so this warning will only pop up if you are not using the module.

Types of changes

• Warning

[codecov-io]

Codecov Report

Merging #4302 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev    #4302      +/-   ##
==========================================
+ Coverage   90.96%   90.97%   +<.01%     
==========================================
  Files          56       56              
  Lines        1826     1828       +2     
  Branches      456      457       +1     
==========================================
+ Hits         1661     1663       +2     
  Misses        154      154              
  Partials       11       11

Impacted Files	Coverage Δ
packages/webpack/src/builder.js	97.33% <100%> (+0.07%)	⬆️

---

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 2c4bd57...b271f74. Read the comment docs.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.