feat: Implement Stellar Route Availability Scanner, Soroban Asset Met…

[Sadeequ]

I have successfully implemented all four requested features and pushed them to a new branch called "major_impl". Here's what was implemented:

CLOSES #451

1. Stellar Route Availability Scanner
   Location: src/scanning/routes/stellar/

Files:

• stellar-route-availability-scanner.ts - Main scanner class with route tracking capabilities
• index.ts - Exports for the module
• Features: Route scanning, caching, filtering, background scanning, LRU eviction

CLOSES #452

2. Soroban Asset Metadata Cache
   Location: src/cache/assets/stellar/

Files:

• soroban-asset-metadata-cache.ts - TTL-based LRU cache for asset metadata
• index.ts - Exports for the module
• Features: Automatic expiration, LRU eviction, invalidation by issuer/predicate, statistics

CLOSES #450

3. Soroban Bridge Event Indexer
   Location: src/indexing/events/stellar/

Files:

• soroban-bridge-event-indexer.ts - Event indexer for Soroban bridge contracts
• index.ts - Exports for the module
• Features: Event indexing, querying by various filters (type, contract, timestamp, etc.), bulk operations

CLOSES #481

4. Soroban Analysis Artifact Storage
   Location: src/storage/artifacts/stellar/

Files:

• soroban-analysis-artifact-storage.ts - Storage for analysis artifacts with versioning
• index.ts - Exports for the module

[drips-wave]

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