Unleash 4.14: User groups and the playground

Unleash 4.14 introduces user groups and a new playground feature to enhance user management and feature flag testing for enterprise users. The user groups feature allows administrators to manage access rights for collections of users collectively, simplifying the process by automatically syncing permissions when new users are added to a group. The playground feature, accessible from the admin UI, enables users to test feature flag configurations without the need for a client SDK, providing insight into enabled flags and variants based on a given context. Additionally, the update includes improvements to OpenAPI documentation, covering all endpoints in the open-source version, with further enhancements expected for pro and enterprise endpoints.