feat(plugin-sass): add useOriginalUrlResolver option to disable resolve-url-loader

[junhea]

Summary

Adds new useOriginalUrlResolver option to disable resolve-url-loader

Related Links

Relative url usage like this should build

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[chenjiahan]

Thanks for the contribution, providing an option to opt-out resolve-url-loader might be useful. I want to redesign the naming of this API, I will submit a PR to update it later.