Enable MemberImportVisibility check on all targets

Author: rnro

Package.swift

@@ -56,3 +56,9 @@ for target in package.targets {
     settings.append(.enableExperimentalFeature("StrictConcurrency=complete"))
     target.swiftSettings = settings
 }
+
+for target in package.targets {
+    var settings = target.swiftSettings ?? []
+    settings.append(.enableUpcomingFeature("MemberImportVisibility"))
+    target.swiftSettings = settings
+}