Add performance monitoring module

Create a performance monitoring module for Kubernetes resources:

Features to implement

• Resource utilization tracking (CPU, memory, disk)
• Node pressure detection
• HPA configuration validation
• Pod QoS analysis
• Resource request/limit optimization suggestions
• Historical performance data collection

Implementation details

• Create lib/analyzers/performance.sh module
• Add performance monitoring to pod/node troubleshooting
• Create interactive performance analysis menu
• Add resource utilization visualization