feat: add reply in private feature

[MohamadJaara]

Summary

Adds support for Reply in private across Kalium and Wire Android.

This lets a user reply privately to a message from a group conversation. The private reply keeps a reference to the original group message, so the receiving side can show the quote when the source message is available.

Kalium changes

• Extends quote metadata with an optional source conversation ID.
• Keeps existing same-conversation replies backward compatible.
• Updates message sending so full quote references can be sent.
• Stores quote source conversation IDs in persistence and drafts.
• Updates message details queries so quoted messages can be resolved across conversations.
• Adds tests for quote mapping, sending, persistence, and migration behavior.

Notes

The new quote field is optional. Old quotes continue to work as before, and clients without the new behavior can still receive the message text.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud