Addon-viewport: Add preset to fix windows import

addons/viewport/preset.js

@@ -0,0 +1 @@
+module.exports = require('./dist/preset');

addons/viewport/register.js

@@ -1,3 +1 @@
-// NOTE: loading addons using this file is deprecated!
-// please use manager.js and preview.js files instead
 require('./dist/register');

addons/viewport/src/preset/index.ts

@@ -0,0 +1,3 @@
+export function managerEntries(entry: any[] = []) {
+  return [...entry, require.resolve('../register')];
+}