feat: add minify option to lightningcss-loader

[witsaint]

Summary

When we use buildin:lightningcss，The production code can only be compressed from the rule，Code space cannot be compressed, such as cssnano's normalizewhitespace feature

for the following reason

The first argument to the stylesheet.to_css method is a fixed false，

So，When we use rspack or rebuild, do we use lightningcss compression capabilities to the user,

At the same time, rsbuild can increase the scalability when built-in that

rsbuild issure#3247

Checklist

• [✅] Tests updated (or not required).
• [✅] Documentation updated (or not required).

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[chenjiahan]

LGTM👍🏻

This option is useful when using style-loader, as the built-in LightningCssMinimizerRspackPlugin can not handle CSS files injected by style-loader, and users can use this option to minify CSS.