Implement EventPublisher class for publishing trade events to Redis
Streams, enabling decoupled downstream processing. Key features:
- EventPublisher wrapping Redis Streams XADD/XREADGROUP commands
- Single and batch publishing with configurable max stream length
- Consumer group management (create/ensure)
- Event reading with pending entry recovery
- Acknowledgment helpers for exactly-once semantics
- Stream info and trimming utilities
- Full TradeEvent serialization/deserialization
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
