♻️ Stabilization of `EmailAddressRegex` type

[LVMVRQUXL]

📝 Description

We want to stabilize the EmailAddressRegex type and its serializer, provided by the EmailAddressRegex.Companion.stringSerializer() function.

🔗 Dependencies

This issue is blocked by the following items:

• ✨ New EmailAddressRegex type in org.kotools.types package #809

✅ Checklist

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

• ♻️ Stabilize the EmailAddressRegex type.
• ♻️ Stabilize the EmailAddressRegex.Companion.stringSerializer() function.
• 📝 Update the unreleased changelog for this issue.
• 📝 After closing this issue, update the status of tracking issues depending only on this one.