UI extensions initial implementation.

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/EntityActions/EntityAction.cs

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+using System;
+using System.Threading.Tasks;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility.EntityActions
+{
+    public class EntityAction
+    {
+        public string Text { get; set; }
+        public Func<object, Task> Clicked { get; set; }
+        public string RequiredPolicy { get; set; }
+        public Func<object, string> ConfirmationMessage { get; set; }
+        public bool Primary { get; set; }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/EntityActions/EntityActionDictionary.cs

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+using System.Collections.Generic;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility.EntityActions
+{
+    public class EntityActionDictionary : Dictionary<string, List<EntityAction>>
+    {
+        
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/EntityActions/EntityActionsConfiguration.cs

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+using System.Collections.Generic;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility.EntityActions
+{
+    public class EntityActionsConfiguration
+    {
+        protected EntityActionDictionary EntityActions { get; set; }
+
+        public EntityActionsConfiguration()
+        {
+            EntityActions = new EntityActionDictionary();
+        }
+
+        public List<EntityAction> Get<T>()
+        {
+            return EntityActions.GetOrAdd(typeof(T).FullName, () => new List<EntityAction>());
+        }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/TableColumns/TableColumn.cs

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+using JetBrains.Annotations;
+using Microsoft.AspNetCore.Components;
+using System;
+using System.Collections.Generic;
+using Volo.Abp.AspNetCore.Components.Extensibility.EntityActions;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility.TableColumns
+{
+    public class TableColumn
+    {
+        public string Title { get; set; }
+        public string Data { get; set; }
+        [CanBeNull]
+        public Func<object, RenderFragment> Render { get; set; }
+        public List<EntityAction> Actions { get; set; }
+
+        public TableColumn()
+        {
+            Actions = new List<EntityAction>();
+        }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/TableColumns/TableColumnDictionary.cs

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+using System.Collections.Generic;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility.TableColumns
+{
+    public class TableColumnDictionary : Dictionary<string, List<TableColumn>>
+    {
+        
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/TableColumns/TableColumnsConfiguration.cs

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+using System.Collections.Generic;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility.TableColumns
+{
+    public class TableColumnsConfiguration
+    {
+        protected TableColumnDictionary TableColumns { get; set; }
+
+        public TableColumnsConfiguration()
+        {
+            TableColumns = new TableColumnDictionary();
+        }
+
+        public List<TableColumn> Get<T>()
+        {
+            return TableColumns.GetOrAdd(typeof(T).FullName, () => new List<TableColumn>());
+        }
+    }
+}

framework/src/Volo.Abp.AspNetCore.Components.WebAssembly/Volo/Abp/AspNetCore/Components/Extensibility/UIExtensions.cs

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+using Volo.Abp.AspNetCore.Components.Extensibility.EntityActions;
+using Volo.Abp.AspNetCore.Components.Extensibility.TableColumns;
+
+namespace Volo.Abp.AspNetCore.Components.Extensibility
+{
+    public class UIExtensions
+    {
+        public static UIExtensions Instance { get; protected set; } = new UIExtensions();
+
+        public EntityActionsConfiguration EntityActions { get; set; }
+
+        public TableColumnsConfiguration TableColumns { get; set; }
+
+        public UIExtensions()
+        {
+            EntityActions = new EntityActionsConfiguration();
+            TableColumns = new TableColumnsConfiguration();
+        }
+    }
+}