Media agent for iOS v4.4.0

New features

• Added support for Swift Package Manager.
• NRMediaTailorTracker: Added a new AWS MediaTailor server-side ad-insertion (SSAI) tracker for AVPlayer (iOS 12+ and tvOS 12+), offering feature parity with NRIMATracker.

Bug Fixes

• ios-publish: Modified retry logic to survive partial pipeline failures.