8dac2e9796
Creates an initial, minimal FLEEngine that parallels the iOS FlutterEngine, and moves engine launch, plugin registration, and binary messenger functionality from FLEViewController to there. Uses the FLE prefix since the current APIs will change to better match FlutterEngine; the current APIs are intended to minimize conceptual changes relative to the current FLEViewController APIs since it's already a substantial change. Further changes will move channels from FLEViewController to FLEEngine, and further align the APIs and functionality with the iOS version. Part of #32421
Flutter Engine
Flutter is Google's mobile app SDK for crafting high-quality native interfaces on iOS and Android in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.
The Flutter Engine is a portable runtime for hosting Flutter applications. It implements Flutter's core libraries, including animation and graphics, file and network I/O, accessibility support, plugin architecture, and a Dart runtime and compile toolchain. Most developers will interact with Flutter via the Flutter Framework, which provides a modern, reactive framework, and a rich set of platform, layout and foundation widgets.
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