refactor(upgrade): re-export the new static upgrade APIs on new entry

Add upgrade-static.umd.js bundles
This allows depending on it without getting a transitive dependency on compiler.

BREAKING CHANGE:

Four newly added APIs in 2.2.0-beta:
downgradeComponent, downgradeInjectable, UpgradeComponent, and UpgradeModule
are no longer exported by @angular/upgrade.
Import these from @angular/upgrade/static instead.

modules/@angular/upgrade/rollup-static.config.js

@@ -0,0 +1,15 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+export default {
+  entry: '../../../dist/packages-dist/upgrade/static.js',
+  dest: '../../../dist/packages-dist/upgrade/bundles/upgrade-static.umd.js',
+  format: 'umd',
+  moduleName: 'ng.upgrade.static',
+  globals: {'@angular/core': 'ng.core'}
+};