feat: support experiments.css

[hardfist]

Related issue (if exists)

closes #2919

Summary

🤖 Generated by Copilot at 7fa32b8

This pull request adds css support as an experimental option for the rspack bundler. It modifies the TypeScript and Rust code in rspack, rspack_binding_options, and rspack_core to handle the new option. It also updates the unit test file to cover the new feature.

Walkthrough

🤖 Generated by Copilot at 7fa32b8

• Add a new css field to the Experiments interface and struct in TypeScript and Rust, respectively, to indicate whether to enable the css support feature for the rspack bundler (link, link, link)
• Add a new css field to the RawExperiments struct in Rust, which mirrors the Experiments field and is used for the conversion between TypeScript and Rust options (link, link, link)
• Add a validation step and a default value for the css field in the getRawExperiments and applyExperimentsDefaults functions in TypeScript, respectively (link, link)
• Add a conditional block to the applyModuleDefaults function in TypeScript, which adds a rule for handling css files and css modules to the module rules array if the css field is true (link, link, link)
• Update the unit test file Defaults.unittest.ts in TypeScript, to check the default and overridden values of the css field and the corresponding module rules (link, link)

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Latest commit: 7fa32b8

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