added API Management for managing site level entity permissions

Oqtane.Client/Services/Interfaces/IApiService.cs

@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Oqtane.Models;
+
+namespace Oqtane.Services
+{
+    /// <summary>
+    /// Service to retrieve and update API information.
+    /// </summary>
+    public interface IApiService
+    {
+        /// <summary>
+        /// returns a list of APIs
+        /// </summary>
+        /// <returns></returns>
+        Task<List<Api>> GetApisAsync(int siteId);
+
+        /// <summary>
+        /// returns a specific API
+        /// </summary>
+        /// <returns></returns>
+        Task<Api> GetApiAsync(int siteId, string entityName);
+
+        /// <summary>
+        /// Updates an API
+        /// </summary>
+        /// <param name="api"></param>
+        /// <returns></returns>
+        Task UpdateApiAsync(Api api);
+    }
+}