feat: after model utility (#7)

* notify after load draft

* Use allSettled for this

* Clean up ESLint

addon/utils/notify-after-load.js

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+import { allSettled } from 'ember-concurrency';
+
+export default function notifyAfterLoad(hash, callback) {
+  allSettled(Object.values(hash))
+    .then(() => {
+      callback(hash);
+    });
+
+  return hash;
+}

app/utils/notify-after-load.js

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+export { default } from 'ember-data-tasks/utils/notify-after-load';

tests/unit/utils/notify-after-load-test.js

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+import notifyAfterLoad from 'dummy/utils/notify-after-load';
+import { module, test } from 'qunit';
+
+module('Unit | Utility | notify after load');
+
+// Replace this with your real tests.
+test('it works', function(assert) {
+  let result = notifyAfterLoad();
+  assert.ok(result);
+});