UnifiedPush/android-connector 3.1.0

on Codeberg

Follow specifications 3.1.0, with migration support, and temporary unavailability intents:

• You can know if a new endpoint comes from a temporary fallback distributor using PushEndpoint.temporary onNewEndpoint.
• Add PushService.onTempUnavailable

Bump compatibility languageVersion to 2.0: require kotlin 2.0.0+

Compile against SDK 36

Use SQLite to store registrations and connections

Bump dependencies