Implement Soroban Event Analyzer

[mijinummi]

🧠 Concept

Analyze event emission patterns in Soroban contracts.

⚠️ Problem

Excessive or poorly structured events can increase resource usage and reduce observability quality.

📁 Implementation Scope

• packages/analyzers/soroban/events/
• packages/rules/soroban/events/

✅ Requirements

• Detect event emissions
• Extract event topics
• Track event frequency
• Estimate event-related resource impact

🎯 Acceptance Criteria

• Event analyzer implemented
• Events detected
• Topics extracted
• Resource impact reported

[ZacLou]

I reviewed the issue and GasGuard’s existing analyzer/rule layout. I would implement a Soroban event analyzer that detects emission sites, extracts topics, counts frequency, and estimates event-related resource impact, then wire the matching rule and add focused fixtures/tests for event detection, topic extraction, and impact reporting. I’ll keep the change bounded to the stated analyzer/rule paths and run the package tests before submitting the PR after assignment.