✨ New `NegativeInteger.unaryMinus()` function

[LVMVRQUXL]

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📝 Description

For all Kotlin platforms and Java, we want to add the NegativeInteger.unaryMinus() experimental function for returning the negative of this integer.

operator fun NegativeInteger.unaryMinus(): PositiveInteger = TODO()

🔗 Dependencies

This issue is blocked by the following items:

• [ ] #821
• [ ] #661

✅ Checklist

See the Issue implementation section in the contributing guidelines before addressing the following checklist.

• [ ] ✨ Add the function with tests, documentation and samples.
• [ ] 📝 Update the unreleased changelog for this issue.
• [ ] 📝 After closing this issue, update the status of tracking issues depending only on this one.