feat!: 2.0.0 Modularization, Melos Support & Localization Refactor

[Numoy]

🚀 Overview This major release (2.0.0) modularizes the survey_kit package to reduce the core package size and allow for more flexible dependency management. It also introduces melos for monorepo management and significantly improves the localization architecture.

💥 Breaking Changes Modularization: AudioContent and related features have been moved to package:survey_kit_audio. VideoContent and related features have been moved to package:survey_kit_video. LottieContent and related features have been moved to package:survey_kit_lottie. Localization: Removed the localizations parameter from SurveyKit. Migrated internal strings to .arb files using flutter_localizations for better maintainability and extensibility. ✨ Features Monorepo: Implemented melos workspace for efficient management of multiple packages (survey_kit, example, etc.). Content Registry: Updated internal registry to support dynamic deserialization of content steps from external packages. 🐛 Fixes Fixed DateTime timezone handling in CustomDateTimeConverter. Added missing JSON serialization methods for TimeResult. Updated test infrastructure to use deterministic Step IDs. 🧹 Chore Updated internal dependencies (including json_annotation). Updated Android Gradle Plugin and Gradle versions for better compatibility. 📚 Migration Guide Please refer to

MIGRATION.md for detailed instructions on how to upgrade your existing project to 2.0.0.