Enhance property descriptions in chart datasets

Updated `LineChartDataset` and `ScatterChartDataset` classes to provide detailed descriptions and default values for various properties. Key changes include the addition of new properties such as `BackgroundColor`, `BorderColor`, `CubicInterpolationMode`, and hover-related properties. Existing properties were also enhanced with clearer documentation, improving usability and guidance for developers.

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Author: gvreddy04

BlazorExpress.ChartJS/Models/ChartDataset/LineChart/LineChartDataset.cs

@@ -144,7 +144,7 @@ public LineChartDataset FillToValue(double value)
     /// </summary>
     [AddedVersion("1.0.0")]
     [DefaultValue("butt")]
-    [Description("Cap style of the line.")]
+    [Description("Cap style of the line. Supported values are 'butt', 'round', and 'square'.")]
     public string BorderCapStyle { get; set; } = "butt";
 
     /// <summary>