Add EuiAutoSizer playground story

src/components/auto_sizer/auto_sizer.stories.tsx

@@ -0,0 +1,48 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+import React from 'react';
+import type { Meta, StoryObj } from '@storybook/react';
+import { disableStorybookControls } from '../../../.storybook/utils';
+
+import { EuiPanel } from '../panel';
+
+import { EuiAutoSizer, EuiAutoSizerProps, EuiAutoSize } from './auto_sizer';
+
+const meta: Meta<EuiAutoSizerProps> = {
+  title: 'EuiAutoSizer',
+  component: EuiAutoSizer,
+  args: {
+    // Component defaults
+    tagName: 'div',
+  },
+};
+
+export default meta;
+type Story = StoryObj<EuiAutoSizerProps>;
+
+export const Playground: Story = {
+  render: ({ ...args }) => (
+    <div
+      // Inherit Storybook demo viewport if no other height/width specified
+      style={{
+        blockSize: args.defaultHeight || 'calc(100vh - 2rem)',
+        inlineSize: args.defaultWidth || '100%',
+      }}
+    >
+      <EuiAutoSizer {...args}>
+        {({ height, width }: EuiAutoSize) => (
+          <EuiPanel style={{ height, width, display: 'inline-block' }}>
+            height: {height}, width: {width}
+          </EuiPanel>
+        )}
+      </EuiAutoSizer>
+    </div>
+  ),
+  argTypes: disableStorybookControls(['children']),
+};