feat(analytics): integrate comprehensive analytics tracking in ClaudeCodeSession

- Track prompt submissions with detailed metrics (length, complexity, attachments)
- Monitor session lifecycle (start, stop, duration, engagement)
- Record tool executions with performance and success metrics
- Track checkpoint creation and restoration events
- Implement enhanced session metrics including:
  - Time to first message
  - Average response time
  - Files created/modified/deleted count
  - Error frequency and recovery attempts
  - Token usage and code generation metrics
- Add session engagement scoring
- Monitor conversation abandonment patterns
- Track agent execution context when applicable

This provides deep insights into user interactions and session
quality for improving the AI coding experience.