add delete network area and test (#381)

Consul.Test/OperatorTest.cs

@@ -158,5 +158,20 @@ public async Task Operator_AreaGet()
             Assert.Equal(area.RetryJoin, result.RetryJoin);
             Assert.Equal(area.PeerDatacenter, result.PeerDatacenter);
         }
+
+        [EnterpriseOnlyFact]
+        public async Task Operetor_AreaDelete()
+        {
+            var peerDataCenter = KVTest.GenerateTestKeyName();
+            var area = new AreaRequest { PeerDatacenter = peerDataCenter, UseTLS = true, RetryJoin = new string[] { "10.1.2.7", "10.1.2.0" } };
+            var createResult = await _client.Operator.AreaCreate(area);
+            var areaId = createResult.Response;
+
+            await _client.Operator.AreaDelete(areaId);
+
+            var req = await _client.Operator.AreaGet(areaId);
+
+            Assert.Null(req.Response);
+        }
     }
 }

Consul/Interfaces/IOperatorEndpoint.cs

@@ -53,5 +53,7 @@ public interface IOperatorEndpoint
         Task<WriteResult<string>> AreaUpdate(AreaRequest area, string areaId, WriteOptions q, CancellationToken cancellationToken = default);
         Task<QueryResult<Area[]>> AreaGet(string areaId, CancellationToken cancellationToken = default);
         Task<QueryResult<Area[]>> AreaGet(string areaId, QueryOptions q, CancellationToken cancellationToken = default);
+        Task<WriteResult> AreaDelete(string areaId, CancellationToken cancellationToken = default);
+        Task<WriteResult> AreaDelete(string areaId, WriteOptions q, CancellationToken cancellationToken = default);
     }
 }

Consul/Operator.cs

@@ -341,6 +341,20 @@ public Task<QueryResult<Area[]>> AreaGet(string areaId, QueryOptions q, Cancella
         {
             return _client.Get<Area[]>($"/v1/operator/area/{areaId}", q).Execute(ct);
         }
+        /// <summary>
+        /// AreaDelete deletes the given network area.
+        /// </summary>
+        public Task<WriteResult> AreaDelete(string areaId, CancellationToken ct = default)
+        {
+            return AreaDelete(areaId, WriteOptions.Default, ct);
+        }
+        /// <summary>
+        /// AreaDelete deletes the given network area.
+        /// </summary>
+        public Task<WriteResult> AreaDelete(string areaId, WriteOptions q, CancellationToken ct = default)
+        {
+            return _client.Delete($"/v1/operator/area/{areaId}", q).Execute(ct);
+        }
     }
 
     public class ConsulLicense