v1.0.8 of adaptive_core

Flutter plugin for the Adaptive SDK Core module. Provides SDK initialization, user session management, and a resilient HTTP client with offline queue for the Adaptive e-learning platform. Changelog excerpt: - Moved iOS podspec to ios/directory (standard Flutter plugin layout). - Lowered iOS minimum deployment target from 15.0 to 13.0. - Pinned AdaptiveCoreCocoaPod dependency to ~> 1.0.10. - Fixed MethodChanneldeclaration to use constconstructor. - Sorted dev_dependenciesalphabetically in pubspec.yaml.