Storybook: Add stories for URLInput component.

packages/block-editor/src/components/url-input/stories/index.story.js

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+/**
+ * Internal dependencies
+ */
+import URLInput from '../';
+
+/**
+ * WordPress dependencies
+ */
+import { useState } from '@wordpress/element';
+
+const meta = {
+	title: 'BlockEditor/URLInput',
+	component: URLInput,
+	parameters: {
+		docs: {
+			canvas: { sourceState: 'shown' },
+			description: {
+				component:
+					'Renders the URL input field used by the `URLInputButton` component. It can be used directly to display the input field in different ways such as in a `Popover` or inline.',
+			},
+		},
+	},
+	argTypes: {
+		value: {
+			description:
+				'This should be set to the attribute (or component state) property used to store the URL.',
+			type: { name: 'string', required: true },
+			control: 'text',
+		},
+		onChange: {
+			action: 'onChange',
+			description:
+				'Called when the value changes. The second parameter is `null` unless the user selects a post from the suggestions dropdown.',
+			type: { name: 'function', required: true },
+			control: { type: null },
+		},
+		onKeyDown: {
+			action: 'onKeyDown',
+			description: 'A callback invoked on the keydown event.',
+			type: { name: 'function' },
+			control: { type: null },
+		},
+		label: {
+			description:
+				'If this property is added, a label will be generated using label property as the content.',
+			type: { name: 'string' },
+			control: 'text',
+		},
+		className: {
+			description:
+				'Adds and optional class to the parent `div` that wraps the URLInput field and popover',
+			type: { name: 'string' },
+			control: 'text',
+		},
+		placeholder: {
+			description:
+				'Placeholder text to show when the field is empty, similar to the [input and textarea attribute of the same name](https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/HTML5_updates#The_placeholder_attribute).',
+			type: { name: 'string' },
+			control: 'text',
+		},
+		disableSuggestions: {
+			description:
+				'Provides additional control over whether suggestions are disabled.',
+			type: { name: 'boolean' },
+			control: 'boolean',
+		},
+	},
+};
+
+export default meta;
+
+export const Default = {
+	render: function Template( { onChange, ...args } ) {
+		const [ value, setValue ] = useState();
+		return (
+			<URLInput
+				{ ...args }
+				onChange={ ( ...changeArgs ) => {
+					onChange( ...changeArgs );
+					setValue( ...changeArgs );
+				} }
+				value={ value }
+			/>
+		);
+	},
+};