The npm package for version 5.0.1 does not include CommonJS resources

* [x] Are you running the latest version?
* [ ] Have you included sample input, output, error, and expected output? 
* [ ] Have you checked if you are using correct configuration?
* [ ] Did you try online [tool](https://naturalintelligence.github.io/fast-xml-parser/)?
* [ ] Have you checked the [docs](https://github.com/NaturalIntelligence/fast-xml-parser/tree/master/docs) for helpful APIs and examples?

### Description
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The package.json files references the lib folder for CommonJS resources but they are not included in the package (the lib folder is missing).
Only the ESM resources are available (in the lib folder).

https://github.com/NaturalIntelligence/fast-xml-parser/blob/3bd66b992e38677594c58ee02a165791202bc4c8/package.json#L5-L16

See https://www.npmjs.com/package/fast-xml-parser/v/5.0.1?activeTab=code

![Image](https://github.com/user-attachments/assets/ad9b3815-9328-4168-839b-47072e0a2731)

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### Input
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**Would you like to work on this issue?**
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- [x] Yes
- [ ] No

I guess that adding the lib folder in the "files" attribute of the package.json file should fix the problem 😸 

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