This reverts commit 3802eb62.

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.

Windows package identifiers are globally unique strings, typically a
GUID. These are required for templates that require a Windows package
name as described in
https://docs.microsoft.com/en-us/windows/win32/appxpkg/appx-portal

Fixes https://github.com/flutter/flutter/issues/82587

[flutter_tools] generate empty plugin registrants for winuwp and fix local engine for winuwp_ (#79827)

* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more