Fix #4936: add the cookie consent theme control.

Oqtane.Server/Startup.cs

@@ -169,6 +169,13 @@ namespace Oqtane
                 options.CustomSchemaIds(type => type.ToString()); // Handle SchemaId already used for different type
             });
             services.TryAddSwagger(_useSwagger);
+
+            //add cookie consent policy
+            services.Configure<CookiePolicyOptions>(options =>
+            {
+                options.CheckConsentNeeded = context => true;
+                options.ConsentCookieValue = Constants.CookieConsentCookieValue;
+            });
         }
 
         // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
@@ -225,6 +232,7 @@ namespace Oqtane
             app.UseAuthentication();
             app.UseAuthorization();
             app.UseAntiforgery();
+            app.UseCookiePolicy();
 
             if (_useSwagger)
             {