Optimize event processing with pipeline and fix a bug #112
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Use a Redis pipeline to batch commands for adding events. This improves performance by reducing the number of round trips to the Redis server, especially when processing a large number of events.
This PR also fixes a bug. When pending entries existed in Redis but hadn't reached the minimum idle time, XAUTOCLAIM didn't return '0-0' as the next ID. Instead, it returned a different ID, causing the consumer to remain stuck until all recovered entries were processed, blocking new entries from being handled.
Fixes chaoss/grimoirelab#760