chore(demos): add grid viewcomponent mvc example

Telerik.Examples.Mvc/Telerik.Examples.Mvc/Controllers/Grid/ViewComponentController.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.AspNetCore.Mvc;
+using Telerik.Examples.Mvc.Models;
+
+namespace Telerik.Examples.Mvc.Controllers.Grid
+{
+    public class ViewComponentController : Controller
+    {
+        public IActionResult ViewComponent()
+        {
+            var random = new Random();
+
+            var data = Enumerable.Range(1, 10)
+                .Select(x => new Product
+                {
+                    Discontinued = x % 2 == 1,
+                    ProductID = x,
+                    ProductName = "Product " + x,
+                    UnitPrice = random.Next(1, 1000),
+                    UnitsInStock = random.Next(1, 1000),
+                    UnitsOnOrder = random.Next(1, 1000)
+
+                })
+                .ToList();
+
+            return View(data);
+        }
+    }
+}

Telerik.Examples.Mvc/Telerik.Examples.Mvc/ViewComponents/GridViewComponent.cs

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+using Microsoft.AspNetCore.Mvc;
+using System.Collections;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Telerik.Examples.Mvc.Models;
+
+namespace Telerik.Examples.Mvc.ViewComponents
+{
+    public class GridViewComponent : ViewComponent
+    {
+        public async Task<IViewComponentResult> InvokeAsync(IEnumerable<Product> gridModel)
+        {
+            return View("default", gridModel);
+        }
+    }
+}

Telerik.Examples.Mvc/Telerik.Examples.Mvc/Views/Grid/ViewComponent.cshtml

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+@{
+    ViewData["Title"] = "View Component";
+}
+<h3>@ViewData["Title"]</h3>
+@model IEnumerable<Product>
+
+@await Component.InvokeAsync("Grid", Model)

Telerik.Examples.Mvc/Telerik.Examples.Mvc/Views/Shared/Components/Grid/Default.cshtml

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+@using Telerik.Examples.Mvc.Models
+
+@model IEnumerable<Product>
+
+@(Html.Kendo().Grid(Model)
+    .Name("grid")
+    .DataSource(dataSource => dataSource
+        .Ajax()
+        .PageSize(5)
+        .ServerOperation(false)
+    )
+    .Columns(columns =>
+    {
+        columns.Bound(product => product.ProductID);
+        columns.Bound(product => product.ProductName);
+        columns.Bound(product => product.UnitsInStock);
+        columns.Bound(product => product.Discontinued);
+    })
+    .Pageable()
+    .Sortable()
+    .Filterable()
+    .Groupable()
+)