✨(react) add DataGrid, SimpleDataGrid components

The DataGrid component can be considered as the core one, which provides
a full controlled component, but more complicated than SimpleDataGrid
which is based on DataGrid. SimpleDataGrid is intended to give a simple
ready-to-use data grid for client side data for example.

packages/react/src/tests/Setup.ts

@@ -0,0 +1,7 @@
+import createFetchMock from "vitest-fetch-mock";
+import { vi } from "vitest";
+
+const fetchMocker = createFetchMock(vi);
+
+// sets globalThis.fetch and globalThis.fetchMock to our mocked version
+fetchMocker.enableMocks();

packages/react/src/tests/deferred.ts

@@ -0,0 +1,24 @@
+/*
+ * Test helper: use a deferred object to control promise resolution without mocking
+ * deep inside our code.
+ */
+export class Deferred<T> {
+  promise: Promise<T>;
+  reject!: (reason?: any) => void;
+  resolve!: (value: T | PromiseLike<T>) => void;
+
+  constructor() {
+    this.promise = this._init();
+  }
+
+  reset() {
+    this.promise = this._init();
+  }
+
+  private _init(): Promise<any> {
+    return new Promise((resolve, reject) => {
+      this.reject = reject;
+      this.resolve = resolve;
+    });
+  }
+}