Unleash 5.3: Playground additions, flexible webhooks, and transparent segments

Unleash 5.3 introduces significant updates focusing on flexibility and telemetry data collection, enhancing user experience through various features. The updated Playground 2.0 allows users to run multiple variables across different environments simultaneously, aiding in debugging and testing. A new webhook feature permits customization of HTTP headers, providing greater flexibility in passing information. Users can now track where segments are applied across projects, flags, and context fields, improving usability and management. The telemetry data update assures users that privacy remains paramount, emphasizing that personally identifiable information is not collected while gathering general usage metrics such as active feature flags and project counts. Users maintain control over their telemetry settings, with opt-out preferences respected.