[Backend] Implement granular metrics tracking for Webhook Event Dispatcher

[emdevelopa]

Description
This task involves system optimization for the Webhook Event Dispatcher module.
The goal is to implement granular metrics tracking for Webhook Event Dispatcher to enhance the platform's robustness, security, and developer experience.

Requirements and context

• Must be secure, tested, and documented
• Adhere to the Drips Wave design and engineering standards
• Ensure full test coverage for new logic
• Specifically focused on backend system optimization and security integrity

Suggested execution

Fork the repo and create a branch
git checkout -b feature/be-implement-granular-metrics-tracking-for-webhook-event-dispatcher
Implement changes

Review existing implementation in Webhook Event Dispatcher
Apply changes: Implement granular metrics tracking for Webhook Event Dispatcher
Ensure robust error handling and logging
Test and commit

Run unit and integration tests for Webhook Event Dispatcher
Cover edge cases and validate security assumptions
Include test output and security notes in the PR
Example commit message
feat(backend): implement granular metrics tracking for Webhook Event Dispatcher

Guidelines

Complexity: High (200 points)
Assignment required before starting
PR description must include: Closes #[issue_id]