Improvements for Blazor UI module entity extensibility system

[hikalkan]

• Lookup component should be improved. Currently, it looks like a textbox.

We will work on these after #6647 merge.

[ilkayilknur]

In order to test the same functionality on the MVC side,

• Open MyProjectNameModuleExtensionConfigurator.cs file in the MyCompanyName.MyProjectName.Domain.Shared project.
• Copy the following code into the ConfigureExtraProperties method.

ObjectExtensionManager.Instance.Modules()
                .ConfigureIdentity(identity =>
                {
                    identity.ConfigureUser(user =>
                    {
                        user.AddOrUpdateProperty<string>("Role", config =>
                        {
                            config.UI.Lookup.Url = "/api/identity/roles";
                            config.UI.Lookup.DisplayPropertyName = "name";
                        });
                    });

                });

• Run the MyCompanyName.MyProjectName.Web project.
• Login and navigate to the IdentityManagement/Users item in the menu.
• Click on the New User button. You will see the Role field in the modal.
• It's a select2 component. As you see, you can see the initial items and filter the items by typing.