operator: add app task status route

src/apps.js

@@ -53,6 +53,7 @@ exports = module.exports = {
     backup,
     listBackups,
 
+    getTask,
     getLocalLogfilePaths,
     getLogs,
 
@@ -934,6 +935,13 @@ async function listByUser(user) {
     return result.filter((app) => canAccess(app, user));
 }
 
+async function getTask(app) {
+    assert.strictEqual(typeof app, 'object');
+
+    if (!app.taskId) return null;
+    return await tasks.get(app.taskId);
+}
+
 async function downloadManifest(appStoreId, manifest) {
     if (!appStoreId && !manifest) throw new BoxError(BoxError.BAD_FIELD, 'Neither manifest nor appStoreId provided');