Unleash addon framework

Unleash is a feature management system designed to streamline software delivery, and its Addon framework enhances integration into development pipelines by offering flexible options for connecting and managing feature flag events. The system provides tools like the Generic Webhook, which posts updates on feature flag changes using customizable Mustache templates, and the Slack addon, which facilitates team communication by notifying Slack channels of feature updates. This framework simplifies the process of keeping development teams informed about production changes, thereby improving collaboration and efficiency in software deployment.