[interactive_media_ads] Add SPM support (flutter#6756)

Restructures the placeholder iOS implementation to follow the Swift Package Manager layout, and enables SPM support.

Also marks the plugin as unpublished since it's not ready for incremental changes to be published yet.

Fixes flutter#146906

packages/interactive_media_ads/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.0.1+1
+
+* Adds Swift Package Manager support.
+
 ## 0.0.1
 
 * Adds platform interface for Android and iOS.

packages/interactive_media_ads/ios/interactive_media_ads.podspec

@@ -14,7 +14,7 @@ Downloaded by pub (not CocoaPods).
   s.license          = { :type => 'BSD', :file => '../LICENSE' }
   s.author           = { 'Flutter Dev Team' => '[email protected]' }
   s.source           = { :http => 'https://github.com/flutter/packages/tree/main/packages/interactive_media_ads/interactive_media_ads' }
-  s.source_files = 'Classes/**/*'
+  s.source_files = 'interactive_media_ads/Sources/interactive_media_ads/**/*.swift'
   s.dependency 'Flutter'
   s.platform = :ios, '12.0'
 
@@ -25,5 +25,5 @@ Downloaded by pub (not CocoaPods).
     'LD_RUNPATH_SEARCH_PATHS' => '/usr/lib/swift',
   }
   s.swift_version = '5.0'
-  s.resource_bundles = {'interactive_media_ads_privacy' => ['Resources/PrivacyInfo.xcprivacy']}
+  s.resource_bundles = {'interactive_media_ads_privacy' => ['interactive_media_ads/Sources/interactive_media_ads/Resources/PrivacyInfo.xcprivacy']}
 end

packages/interactive_media_ads/ios/interactive_media_ads/Package.swift

@@ -0,0 +1,28 @@
+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import PackageDescription
+
+let package = Package(
+  name: "interactive_media_ads",
+  platforms: [
+    .iOS("12.0")
+  ],
+  products: [
+    .library(name: "interactive-media-ads", targets: ["interactive_media_ads"])
+  ],
+  dependencies: [],
+  targets: [
+    .target(
+      name: "interactive_media_ads",
+      dependencies: [],
+      resources: [
+        .process("Resources")
+      ]
+    )
+  ]
+)

packages/interactive_media_ads/pubspec.yaml

@@ -2,7 +2,7 @@ name: interactive_media_ads
 description: A Flutter plugin for using the Interactive Media Ads SDKs on Android and iOS.
 repository: https://github.com/flutter/packages/tree/main/packages/interactive_media_ads
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+interactive_media_ads%22
-version: 0.0.1
+version: 0.0.1+1
 
 environment:
   sdk: ^3.2.3