feat: implement retry for http requests

[cre8ivejp]

Retry Implementation Checklist

• Phase 1 - Add Retry Configuration Options
• Phase 2 - Create Reusable Retry Utility
• Phase 3 - Implement Retry at HTTP Level
• Phase 4 - Add Deadline to Cache Processors
• Phase 5 - Improve Event Flushing with Bounded Retries
• Phase 6 - Fix Error Metrics Classification
• Phase 7 - Remove Redundant Error Metrics for Feature Not Found