Move apk module to apk-ng

In preparation to preserve the existing old apk module codebase so
that the old implementation can live side-by-side the next generation.

app/apk-ng/src/main/java/com/topjohnwu/magisk/ui/home/HomeScreen.kt

@@ -1014,7 +1014,7 @@ private fun ManagerInstallComposableDialog(
                 text = stringResource(CoreR.string.install),
                 onClick = {
                     showDialog.value = false
-                    DownloadEngine.startWithActivity(activity, activity.extension, Subject.App())
+                    DownloadEngine.startWithActivity(activity, Subject.App())
                 },
                 modifier = Modifier.weight(1f),
                 colors = ButtonDefaults.textButtonColorsPrimary()

app/apk-ng/src/main/java/com/topjohnwu/magisk/ui/module/ModuleScreen.kt

@@ -119,7 +119,7 @@ fun ModuleScreen(viewModel: ModuleViewModel) {
             onDownload = { install ->
                 showOnlineDialog.value = false
                 DownloadEngine.startWithActivity(
-                    activity, activity.extension,
+                    activity,
                     OnlineModuleSubject(pendingOnlineModule!!, install)
                 )
                 pendingOnlineModule = null