Work around @_exported-public import bug (#477)

We've relied on fine-grained GRDB exports via, e.g.:

```swift
@_exported import class GRDB.Database
```

But it turns out this breaks as soon as you have an explicit `public import` in the same module:

```swift
public import class GRDB.Database
```

To work around this bug, we can use `#if` blocks to make each mutually exclusive.

Author: stephencelis

Examples/Examples.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -34,7 +34,7 @@ struct RemindersApp: App {
           isPresented: $syncEngineDelegate.isDeleteLocalDataAlertPresented
         ) {
           Button("Reset", role: .destructive) {
-            Task {
+            _ = Task {
               try await syncEngine.deleteLocalData()
             }
           }
@@ -100,7 +100,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
     _ windowScene: UIWindowScene,
     userDidAcceptCloudKitShareWith cloudKitShareMetadata: CKShare.Metadata
   ) {
-    Task {
+    _ = Task {
       try await syncEngine.acceptShare(metadata: cloudKitShareMetadata)
     }
   }
@@ -114,7 +114,7 @@ class SceneDelegate: UIResponder, UIWindowSceneDelegate {
     else {
       return
     }
-    Task {
+    _ = Task {
       try await syncEngine.acceptShare(metadata: cloudKitShareMetadata)
     }
   }

Examples/Reminders/RemindersApp.swift

@@ -88,7 +88,7 @@ class RemindersDetailModel: HashableObject {
     }
   }
 
-  private var remindersQuery: some StructuredQueriesCore.Statement<Row> {
+  private var remindersQuery: some Statement<Row> & Sendable {
     Reminder
       .where {
         if !showCompleted {

Examples/Reminders/RemindersDetail.swift

@@ -390,7 +390,7 @@ nonisolated func handleReminderStatusUpdate() {
 
 @DatabaseFunction
 nonisolated func createDefaultRemindersList() {
-  Task {
+  _ = Task {
     @Dependency(\.defaultDatabase) var database
     try await database.write { db in
       try RemindersList.insert {

Examples/Reminders/Schema.swift

@@ -1,4 +1,3 @@
-import GRDB
 import IssueReporting
 import SQLiteData
 import SwiftUI
@@ -227,7 +226,7 @@ struct SearchRemindersView: View {
         }
         Spacer()
         Button(model.showCompletedInSearchResults ? "Hide" : "Show") {
-          Task { try await model.showCompletedButtonTapped() }
+          _ = Task { try await model.showCompletedButtonTapped() }
         }
       }
     }

Examples/Reminders/SearchReminders.swift

@@ -1,4 +1,3 @@
-import GRDB
 import SQLiteData
 import SwiftUI
 import SwiftUINavigation

Examples/Reminders/TagsForm.swift

@@ -1,11 +1,13 @@
 #if canImport(CloudKit)
   public import CloudKit
-  public import Dependencies
+  import ConcurrencyExtras
   import GRDB
-  public import SwiftUI
+  import IssueReporting
   public import StructuredQueries
 
-  #if canImport(UIKit)
+  #if canImport(SwiftUI) && canImport(UIKit) && !os(tvOS) && !os(watchOS)
+    public import Dependencies
+    public import SwiftUI
     public import UIKit
   #endif
 
@@ -255,7 +257,7 @@
     }
   }
 
-  #if canImport(UIKit) && !os(tvOS) && !os(watchOS)
+  #if canImport(SwiftUI) && canImport(UIKit) && !os(tvOS) && !os(watchOS)
     /// A view that presents standard screens for adding and removing people from a CloudKit share \
     /// record.
     ///
@@ -348,7 +350,7 @@
               }
 
               Button("Stop Sharing", role: .destructive) {
-                Task {
+                _ = Task {
                   try await syncEngine.unshare(share: sharedRecord.share)
                   try await syncEngine.fetchChanges()
                   dismiss()