feat(create-rsbuild): enable allowImportingTsExtensions

[chenjiahan]

Summary

Enable allowImportingTsExtensions to allow TypeScript files to import each other with a TypeScript-specific extension like .ts, .mts, or .tsx.

Related Links

https://www.typescriptlang.org/tsconfig/#allowImportingTsExtensions

Checklist

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

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