feat: Session Replay App Life Cycle

[abelonogov-ld]

• Stop/Start SR on session expiring backround
• Allow multiple subscribers for App Life Cycle events

---

Note

Introduce AppLifecycleManager and stream-based session changes; refactor Session Replay to start/stop with app lifecycle and reinitialize on session resets, powered by a new Broadcaster.

• Core/Common:
  • Add Broadcaster<Value> actor to fan-out AsyncStream events to multiple subscribers.
  • Update Task.sleep(seconds:) to use NSEC_PER_SEC.
  • GraphQLClient: pass through NetworkError before decoding fallback.
• Observability:
  • Replace ObservabilityContext with a class; add appLifecycleManager and make core refs immutable.
  • Introduce AppLifecycleManager that exposes app lifecycle as AsyncStream<AppLifeCycleEvent>.
  • ObservabilityClientFactory: create and inject AppLifecycleManager into SessionManager and ObservabilityContext.
  • Overhaul SessionManager:
    • Subscribe to AppLifecycleManager (remove NotificationCenter observers).
    • Provide sessionChanges() AsyncStream<SessionInfo> and compute timeout using DispatchTime.
    • Reset session on background timeout; log resets.
  • Remove SessionState enum; expand SessionInfo defaults and attributes.
  • Add test SessionManagerMemoryTests to assert deallocation (no leak).
• Session Replay:
  • Add SessionReplayEventGenerator to build RRWeb-compatible events (image, viewport, interactions).
  • Refactor SessionReplayExporter:
    • Lazy initialize/identify session; listen to sessionChanges() to reinitialize.
    • Use SessionReplayEventGenerator; add logging; clean up on deinit.
  • SnapshotTaker: observe lifecycle to start/stop periodic screenshots; require AppLifecycleManaging.
  • SessionReplayService: pass appLifecycleManager to SnapshotTaker; include log in SessionReplayContext.
• TestApp:
  • Update sample config/mobile key; minor API rename used by snapshot button.
• Misc:
  • Remove unused payloadEncoded.txt; minor cleanups.

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