Add tgrid row-drag-base custom sample

samples/grids/tree-grid/row-drag-base/App.razor

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+@using IgniteUI.Blazor.Controls
+
+<div class="container vertical ig-typography">
+    <div class="container horizontal fill">
+        <div class="container vertical" style="padding: 0.5rem;">
+            <IgbTreeGrid
+            AutoGenerate="false"
+            Name="treeGrid"
+            @ref="treeGrid"
+            Id="treeGrid"
+            Data="EmployeesNestedData"
+            ChildDataKey="Employees"
+            RowDraggable=true
+            RowDragEndScript="OnRowDragEndHandler"
+            Width="100%"
+            Height="100%"
+           >
+                <IgbColumn
+                Field="Name"
+                Header="Name"
+                DataType="GridColumnDataType.String"
+                Sortable="true"
+                Editable="true"
+                >
+                </IgbColumn>
+
+                <IgbColumn
+                Field="HireDate"
+                Header="Hire Date"
+                DataType="GridColumnDataType.Date"
+                Sortable="true"
+                >
+                </IgbColumn>
+
+                <IgbColumn
+                Field="Age"
+                Header="Age"
+                DataType="GridColumnDataType.Number"
+                Sortable="true"
+                >
+                </IgbColumn>
+            </IgbTreeGrid>
+        </div>
+        <div class="container vertical" style="padding: 0.5rem;">
+            <IgbTreeGrid AutoGenerate="false"
+                         Name="treeGrid2"
+                         @ref="treeGrid2"
+                         Id="treeGrid2"
+                         Data="Data2"
+                         EmptyGridMessage="Drag and Drop a row from the left grid to this grid"
+                         ChildDataKey="Employees"
+                         Width="100%"
+                         Height="100%"
+                         >
+                <IgbColumn Field="Name"
+                           Header="Name"
+                           DataType="GridColumnDataType.String"
+                           Sortable="true"
+                           Editable="true"
+                           >
+                </IgbColumn>
+
+                <IgbColumn Field="HireDate"
+                           Header="Hire Date"
+                           DataType="GridColumnDataType.Date"
+                           Sortable="true"
+                           >
+                </IgbColumn>
+
+                <IgbColumn Field="Age"
+                           Header="Age"
+                           DataType="GridColumnDataType.Number"
+                           Sortable="true"
+                           >
+                </IgbColumn>
+            </IgbTreeGrid>
+        </div> 
+    </div>
+</div>
+
+@code {
+
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        var treeGrid = this.treeGrid;
+        var treeGrid2 = this.treeGrid2;        
+
+    }
+
+    protected override void OnInitialized()
+    {
+        this.Data2 = new List<EmployeesNestedDataItem_EmployeesItem>() { };
+    }
+
+    private IgbTreeGrid treeGrid;
+    private IgbTreeGrid treeGrid2;
+
+    private List<EmployeesNestedDataItem_EmployeesItem> Data2 { get; set; }
+
+    private EmployeesNestedData _employeesNestedData = null;
+    public EmployeesNestedData EmployeesNestedData
+    {
+        get
+        {
+            if (_employeesNestedData == null)
+            {
+                _employeesNestedData = new EmployeesNestedData();
+            }
+            return _employeesNestedData;
+        }
+    }
+
+}

samples/grids/tree-grid/row-drag-base/BlazorClientApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <RazorLangVersion>3.0</RazorLangVersion>
+    <AssemblyName>Infragistics.Samples</AssemblyName>
+    <RootNamespace>Infragistics.Samples</RootNamespace>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <NoWarn>1701;1702,IDE0028,BL0005,0219,CS1998</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="IgniteUI.Blazor" Version="23.2.218" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="8.0.0" />
+    <PackageReference Include="System.Net.Http.Json" Version="8.0.0" />
+  </ItemGroup>
+
+</Project>

samples/grids/tree-grid/row-drag-base/BlazorClientApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29613.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BlazorClientApp", "BlazorClientApp.csproj", "{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F69CC3F0-BCD1-4CE6-9F39-CBED14E7FA78}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FC52AAC8-4488-40AE-9621-75F6BA744B18}
+	EndGlobalSection
+EndGlobal