v0.3.0 of asr_lib

On-device speech recognition for Flutter powered by sherpa-onnx. Changelog excerpt: > Breaking change: This release removes all Android/Kotlin native code and replaces the Platform Channel bridge with a pure-Dart implementation using the sherpa_onnxFlutter package. - Pure-Dart ASR engine— AsrLibnow uses sherpa_onnxdirectly instead of the previous Kotlin native AAR + Platform Channel bridge. - Cross-platform support— works on Android, iOS, macOS, Windows, and Linux (all platforms supported by sherpa_onnx+ record). - Audio capture via recordpackage— [...]