feat: implement Soroban Contract Inheritance Analyzer (#485)

[SharifIbrahimDev]

What was implemented

• Created src/analysis/stellar/inheritance/ module
• Implemented StellarInheritanceAnalyzer class that:
  • Detects trait definitions (trait TraitName { ... })
  • Detects trait implementations (impl Trait for Contract)
  • Builds inheritance hierarchies with depth calculation
  • Identifies potential risks (especially deep hierarchies that can affect gas usage and auditability)
  • Generates detailed hierarchy reports with recommendations
• Added proper types (types.ts)
• Added comprehensive tests (inheritance-analyzer.spec.ts)
• Exported the analyzer from index.ts

Changes Made

• src/analysis/stellar/inheritance/types.ts
• src/analysis/stellar/inheritance/inheritance-analyzer.ts
• src/analysis/stellar/inheritance/index.ts
• src/analysis/stellar/inheritance/inheritance-analyzer.spec.ts

Acceptance Criteria Met

• ✅ Detect trait usage
• ✅ Generate hierarchy reports
• ✅ Inheritance analysis fully implemented in src/analysis/stellar/inheritance/

Closes #485

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