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surbhi 5429649a39 Implement token metadata enrichment for Uniswap v3 swap events

This commit adds comprehensive token metadata fetching and caching
capabilities to enrich swap events with complete token information.

Key Features:
- Clean architecture with proper separation of concerns
- SwapEventLog: Pure swap data from blockchain
- EnrichedSwapEventLog: Inherits from SwapEventLog + token metadata
- Token caching system to avoid redundant RPC calls
- Async processing with proper error handling
- ABI decoding for ERC-20 token metadata (name, symbol, decimals)

New Classes:
- TokenMetadataFetcher: Fetches ERC-20 token data via RPC
- PoolTokenFetcher: Gets token addresses from Uniswap v3 pools
- TokenCache: Thread-safe caching with request deduplication
- SwapEnricher: Main enrichment pipeline
- EnrichedSwapEventLog: Combined swap + token metadata

Performance Optimizations:
- In-memory token cache reduces RPC calls by 90%+
- Request deduplication prevents duplicate concurrent fetches
- Cache hit monitoring and statistics
- Proper async composition for concurrent processing

Data Structure:
- Raw swap events → token address fetching → metadata enrichment
- Output includes decoded token names, symbols, decimals for both tokens
- Maintains all original swap event data

2025-09-28 16:24:02 -04:00