add Jwt authorization support for for API

Oqtane.Client/Services/Interfaces/IUserService.cs

@@ -104,5 +104,10 @@ namespace Oqtane.Services
         /// <returns></returns>
         Task<bool> ValidatePasswordAsync(string password);
 
+        /// <summary>
+        /// Get token for current user
+        /// </summary>
+        /// <returns></returns>
+        Task<string> GetTokenAsync();
     }
 }

Oqtane.Client/Services/UserService.cs

@@ -79,5 +79,10 @@ namespace Oqtane.Services
         {
             return await GetJsonAsync<bool>($"{Apiurl}/validate/{WebUtility.UrlEncode(password)}");
         }
+
+        public async Task<string> GetTokenAsync()
+        {
+            return await GetStringAsync($"{Apiurl}/token");
+        }
     }
 }