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In this commit, we introduce an asynchronous processing queue for GossipTimestampRange messages in the GossipSyncer. This change addresses a critical issue where the gossiper could block indefinitely when processing timestamp range messages during periods of high load. Previously, when a peer sent a GossipTimestampRange message, the gossiper would synchronously call ApplyGossipFilter, which could block on semaphore acquisition, database queries, and rate limiting. This synchronous processing created a bottleneck where the entire peer message processing pipeline would stall, potentially causing timeouts and disconnections. The new design adds a timestampRangeQueue channel with a capacity of 1 message and a dedicated goroutine for processing these messages asynchronously. This follows the established pattern used for other message types in the syncer. When the queue is full, we drop messages and log a warning rather than blocking indefinitely, providing graceful degradation under extreme load conditions.