add ability to view Migration History

Oqtane.Client/Services/MigrationHistoryService.cs

@@ -0,0 +1,34 @@
+using Oqtane.Models;
+using System.Net.Http;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using Oqtane.Documentation;
+using Oqtane.Shared;
+
+namespace Oqtane.Services
+{
+    /// <summary>
+    /// Service to manage <see cref="MigrationHistory/>s on the Oqtane installation.
+    /// </summary>
+    public interface IMigrationHistoryService
+    {
+        /// <summary>
+        /// Get all <see cref="MigrationHistory"/>s
+        /// </summary>
+        /// <returns></returns>
+        Task<List<MigrationHistory>> GetMigrationHistoryAsync();
+    }
+
+    [PrivateApi("Don't show in the documentation, as everything should use the Interface")]
+    public class MigrationHistoryService : ServiceBase, IMigrationHistoryService
+    {
+        public MigrationHistoryService(HttpClient http, SiteState siteState) : base(http, siteState) { }
+
+        private string Apiurl => CreateApiUrl("MigrationHistory");
+
+        public async Task<List<MigrationHistory>> GetMigrationHistoryAsync()
+        {
+            return await GetJsonAsync<List<MigrationHistory>>(Apiurl);
+        }
+    }
+}