🗑️ Deprecation of toStrictlyNegativeInt extension function with warning level

[LVMVRQUXL]

📝 Description

We would like to deprecate the Number.toStrictlyNegativeInt() extension function with a warning level for using the StrictlyNegativeInt.Companion.create(Number) function instead.

🔗 Dependencies

This issue is blocked by the following ones:

• ✨ Stabilization of StrictlyNegativeInt.Companion.create* factory functions  #441

✅ Checklist

• Deprecate the declaration with a warning level, refactor its usages and update the unreleased changelog.
• Close this issue as completed and update tracking ones if present.

[LVMVRQUXL]

We are not ready to implement this change.