* Add FlPluginRegistry and FlPluginRegistrar

* Fix child removal after reuse by other BitmapCanvas
* Address review comments

This reverts commit 40043b5f.

Tested: Manual test via workstation product
BUG: 50875

- Adds a way to provide an AOT library to the C API.
- Adds app.so to the information provided by DartProject.
- Fixes the engine to only do static snapshot linking for Windows in
  debug mode, not all modes, so that the provided library is used.

Engine side of https://github.com/flutter/flutter/issues/38477

This reverts commit 1166a354.

Reason: breaks dashboard

Fixes https://github.com/flutter/flutter/issues/56938

Covers the remaining API surface of the semantics library.

Based on Kaushik's work for iOS CPU profiling, I added the memory profiling within the same scheduled task.

The memory profiling methodologies were discussed in the internal doc. Please see go/flutter-ios-memory-profiling.