Enable MemberImportVisibility check on all targets

Author: rnro

Package.swift

@@ -58,3 +58,9 @@ let package = Package(
 
 // Test-only dependencies.
 package.dependencies += [.package(url: "https://github.com/apple/swift-nio", from: "2.62.0")]
+
+for target in package.targets {
+    var settings = target.swiftSettings ?? []
+    settings.append(.enableUpcomingFeature("MemberImportVisibility"))
+    target.swiftSettings = settings
+}