Refactor Plus packages to utilize new Dart 3 language features - Kavan Desai

As the Dart community has the latest Dart 3 alpha release version, the flutter community's plus plugin needs to get upgraded with the Dart 3 new language features. As Dart 3 provides plethora of interesting features which can be used in plus plugins. As plus plugin depends on native calls which can be overcome by interop feature. The goal of this project is to enhance the Plus packages by utilising the new features of the Dart 3 language, such as records, pattern matching, and direct platform library interop, which are not supported by the present version.