Fix #4936: add the cookie consent theme control.

Oqtane.Client/Services/CookieConsentService.cs

@@ -0,0 +1,31 @@
+using Oqtane.Models;
+using System.Threading.Tasks;
+using System.Net.Http;
+using System;
+using Oqtane.Documentation;
+using Oqtane.Shared;
+using System.Globalization;
+
+namespace Oqtane.Services
+{
+    /// <inheritdoc cref="ICookieConsentService" />
+    [PrivateApi("Don't show in the documentation, as everything should use the Interface")]
+    public class CookieConsentService : ServiceBase, ICookieConsentService
+    {
+        public CookieConsentService(HttpClient http, SiteState siteState) : base(http, siteState) { }
+
+        private string ApiUrl => CreateApiUrl("CookieConsent");
+
+        /// <inheritdoc />
+        public async Task<bool> CanTrackAsync()
+        {
+            return await GetJsonAsync<bool>($"{ApiUrl}/CanTrack");
+        }
+
+        public async Task<string> CreateConsentCookieAsync()
+        {
+            var cookie = await GetStringAsync($"{ApiUrl}/CreateConsentCookie");
+            return cookie ?? string.Empty;
+        }
+    }
+}