v1.1.0 of gt_api

A robust and elegant API client wrapper for Flutter and Dart applications to streamline RESTful API integrations. Changelog excerpt: - Changed - Flutter SDK Upgrade: Upgraded package environment and constraints to require Flutter >=3.44.2 and Dart >=3.12.0 <4.0.0 (matching Flutter 3.44.2 release). - iOS Target Bump: Upgraded iOS deployment target to 15.0 to ensure compatibility with Swift Package Manager and modern iOS configurations under Flutter 3.44.2. - Added default Android platform setup in the example project.