This reverts commit 4bb3a8af.

* Add a new PrebuiltFlutterApplicationPackage interface.

* Review feedback

* Rename bundleDir to uncompressedBundle

* update icons

* add regression test

* add fix for pie_chart_outline

This reverts commit 5257f029.

* Building shared C source code as part of the native build for platforms Android, iOS, Linux desktop, MacOS desktop, and Windows desktop.
* Sample code doing a synchronous FFI call.
* Sample code doing a long running synchronous FFI call on a helper isolate.
* Use of `package:ffigen` to generate the bindings.

Improve iOS fidelity of `barrierColor`s and edge decorations for full-screen Cupertino page transitions (#95537)