feat(types): add type declarations for normal CSS module

[chenjiahan]

Summary

Add type declarations for normal CSS module, this is required when TypeScript's new noUncheckedSideEffectImports option is enabled.

Related Links

• resolve [Bug]: Missing type declaration for CSS imports that are not CSS Modules #5380
• https://www.typescriptlang.org/tsconfig/#noUncheckedSideEffectImports

Checklist

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

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