feat: include chartjs script in asset bundle via cdn

limited to chartjs 3.9.1 as 4.0 is an esm-only package

Refs: #25

src/assets/ChartjsAsset.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+namespace practically\chartjs\assets;
+
+use Yii;
+use yii\helpers\Url;
+use yii\web\AssetBundle;
+use yii\web\View;
+
+/**
+ * @copyright 2024 Practically.io. All rights reserved
+ */
+class ChartjsAsset extends AssetBundle
+{
+
+    /**
+     * @var array
+     */
+    public $js = [
+        'https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.9.1/chart.min.js',
+    ];
+
+    /**
+     * @var array
+     */
+    public $depends = [
+        'yii\web\YiiAsset',
+    ];
+
+}

src/widget/Chart.php

@@ -4,6 +4,7 @@
 
 namespace practically\chartjs\widget;
 
+use practically\chartjs\assets\ChartjsAsset;
 use practically\chartjs\components\Dataset;
 use practically\chartjs\components\ScatterDataset;
 use Yii;
@@ -121,6 +122,8 @@ public function init(): void
             $this->jsVar = $this->id;
         }
 
+        ChartjsAsset::register($this->view);
+
         parent::init();
     }