fix(logger): improve logger with dbConnectionPool

[unadlib]

Database Connection Pool

• New DBConnectionPool class with intelligent connection management
• Configurable connection limits (default: 2 connections per database) to prevent Chrome's I/O blocking
• Automatic connection cleanup with idle timeout management
• Priority-based operation queuing to ensure critical logs are processed first

Performance Enhancements

• Lazy initialization with configurable delay (default: 2 seconds) to reduce startup I/O pressure
• Chrome 121+ relaxed durability mode support for 3-30x better write performance
• Chrome 122+ Storage Buckets API integration for better database isolation
• Optimized batch operations to reduce LevelDB write amplification

Enhanced Monitoring

• Comprehensive performance metrics including connection utilization, queue depth, and operation timing
• Error tracking and reporting for better observability
• Real-time queue monitoring with priority distribution analysis