Simplify rollout management with the new environments feature

Unleash has introduced a new environments feature designed to simplify the management of feature rollouts across multiple deployment environments, such as development, testing, staging, and production. This feature is generally available in version 4.3 and aims to make it easier for all customers, including open-source, Pro, and Enterprise, to configure independent rollout strategies for each environment. By using scoped API tokens, users can manage feature activation more securely and avoid mistakes in user segmentation. The environments are fully separated, allowing for individual usage metrics and insights, and enabling role-based access control for managing user permissions. Existing Unleash users will find a 'default' environment already set up, with the ability to enable or disable environments for projects as needed. This feature promises to enhance clarity and control over deployment processes by allowing users to define environments and strategies once, while Unleash handles the rest.