2022-07-20

Added support for Release Groups - listing, creating, updating and deleting.
Added support for Releases - listing, creating, updating, deleting and webhook notifications.
Added support for Feature Release Assignments - listing, updating and webhook notification.
Added support for reading and updating timeframe granularity for features and releases.
Replaced wrong snake_case error codes custom_field.notFound, hierarchy_entity.notFound with camelCase ones customField.notFound, hierarchyEntity.notFound