[TASK][Timpani-n] Implement signal delivery timing monitoring

[LGSI-KarumuriHari]

📝 Task Description

Implement eBPF program (sigwait.bpf.c) to monitor signal delivery timing and deadlines.

📋 Checklist

• Design and implement sigwait.bpf.c eBPF program
• Add hooks for signal delivery events
• Implement timestamp capture for signal delivery
• Track signal latency metrics
• Integrate with userspace monitoring
• Document signal monitoring functionality

🔗 Related Requirement

Relates to #24 (BPF Integration)
Relates to #23 (Signal Handling)
Relates to #22 (Monitoring)

📐 Implementation Guidelines

• Functional Requirement: FR-5.1.2 - Monitor signal delivery timing
• Component: timpani-n/BPF Monitoring/Signal Monitoring
• Monitor SIGALRM and other task-related signals
• Track signal delivery latency with high precision
• Correlate signal delivery with task deadlines

🧪 Testing Method

• Unit test: Verify eBPF program loads correctly
• Integration test: Validate signal timing capture accuracy
• Real-time test: Ensure monitoring doesn't affect signal delivery timing

[jayakrishnan04b]

@basheerFZ Please assign this feature implementation to me.