cabana: avoid dead locks and improve responsiveness

[deanlee]

This PR addresses potential deadlocks and enhances the overall responsiveness.

Main Changes:

1. Enhanced the handling of thread states to prevent deadlocks, especially during the seeking.Introduced more granular locks and condition variable notifications to ensure smooth transitions between different states (e.g., seeking, pausing, merging and resuming).
2. Improved the mechanism for updating events and seeking within the timeline to make the UI more responsive to user inputs.
3. Optimized the event processing loop to avoid recursive calls, reducing latency and ensuring timely updates.
4. Introduced mechanisms to detect and handle incorrect timestamps, preventing hangs caused by erroneous timestamps and ensuring smooth playback.
5. fix race conditions in replay::buildTimeline.

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