[WIP] [MS-1283] Use kotlin serialization in event and event payload subclasses

[meladRaouf]

JIRA ticket
Will be released in: 2026.1.0

Notable changes

• Use Kotlin serialization in event and event payload subclasses

Testing guidance

• Generate any session type and verify that it syncs successfully with the backend.

Additional work checklist

• Effect on other features and security has been considered
• Design document marked as "In development" (if applicable)
• External (Gitbook) and internal (Confluence) Documentation is up to date (or ticket created)
• Test cases in Testiny are up to date (or ticket created)
• Other teams notified about the changes (if applicable)

[sonarqubecloud]

Quality Gate failed

Failed conditions
58.4% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud