General `package.json` fixes

[ZaLiTHkA]

this PR includes two changes:

• repair invalid packageManager string in root package.json file, as this ended up with a letter in the SemVer string.
• add fs-extra to the project package, as this is imported into the xml.ts file. associated @types package updated to match on major version.

based on the @types/fs-extra that was already there, it seems like this was originally used at major version 9. so please do let me know if upgrading to 11 turns out to be a problem.

---

executing npm run test in the root of the repo passed all tests. I've also installed this from a local folder path and used it successfully in a personal project to confirm.

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[ZaLiTHkA]

closing this PR as Max has left the Ionic Team and it seems that nobody else was actively maintaining this project.