CHORE | WTM-454 | Move utils folder to an internal package

[dcoscolla-intermedia]

Closes #454

📑 Changes:

• Create a new internal package named utils
• Refactor extension and webpage to use utils from the new package
• Remove duplicated code

✅ Checks

• [x] My pull request adheres to the code style of this project
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [x] All the tests have passed

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