Victoria Ashworth 6d19fa3bfa
Add Swift Package Manager as new opt-in feature for iOS and macOS (#146256)
This PR adds initial support for Swift Package Manager (SPM). Users must opt in. Only compatible with Xcode 15+.

Fixes https://github.com/flutter/flutter/issues/146369.

## Included Features

This PR includes the following features:
* Enabling SPM via config 
`flutter config --enable-swift-package-manager`
* Disabling SPM via config (will disable for all projects) 
`flutter config --no-enable-swift-package-manager`
* Disabling SPM via pubspec.yaml (will disable for the specific project)
```
flutter:
  disable-swift-package-manager: true
```
* Migrating existing apps to add SPM integration if using a Flutter plugin with a Package.swift
  * Generates a Swift Package (named `FlutterGeneratedPluginSwiftPackage`) that handles Flutter SPM-compatible plugin dependencies. Generated package is added to the Xcode project.
* Error parsing of common errors that may occur due to using CocoaPods and Swift Package Manager together
* Tool will print warnings when using all Swift Package plugins and encourage you to remove CocoaPods

This PR also converts `integration_test` and `integration_test_macos` plugins to be both Swift Packages and CocoaPod Pods.

## How it Works
The Flutter CLI will generate a Swift Package called `FlutterGeneratedPluginSwiftPackage`, which will have local dependencies on all Swift Package compatible Flutter plugins.  

The `FlutterGeneratedPluginSwiftPackage` package will be added to the Xcode project via altering of the `project.pbxproj`. 

In addition, a "Pre-action" script will be added via altering of the `Runner.xcscheme`. This script will invoke the flutter tool to copy the Flutter/FlutterMacOS framework to the `BUILT_PRODUCTS_DIR` directory before the build starts. This is needed because plugins need to be linked to the Flutter framework and fortunately Swift Package Manager automatically uses `BUILT_PRODUCTS_DIR` as a framework search path.

CocoaPods will continue to run and be used to support non-Swift Package compatible Flutter plugins.

## Not Included Features

It does not include the following (will be added in future PRs):
* Create plugin template
* Create app template
* Add-to-App integration
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This directory contains tools and resources that the Flutter team uses during the development of the framework. The tools in this directory should not be necessary for developing Flutter applications, though of course, they may be interesting if you are curious.

The tests in this directory are run in the framework_tests_misc-* shards.