Enable column encryption setting (#908)

* Enable the Column Encryption advanced security connection setting and add supporting tests.

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionDetails.cs

@@ -99,6 +99,22 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
             }
         }
 
+        /// <summary>
+        /// Gets or sets a value that specifies that Always Encrypted functionality is enabled in a connection.
+        /// </summary>
+        public string ColumnEncryptionSetting
+        {
+            get
+            {
+                return GetOptionValue<string>("columnEncryptionSetting");
+            }
+
+            set
+            {
+                SetOptionValue("columnEncryptionSetting", value);
+            }
+        }
+
         /// <summary>
         /// Gets or sets a Boolean value that indicates whether SQL Server uses SSL encryption for all data sent between the client and server if the server has a certificate installed.
         /// </summary>

src/Microsoft.SqlTools.ServiceLayer/Connection/Contracts/ConnectionDetailsExtensions.cs

@@ -22,6 +22,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Connection.Contracts
                 UserName = details.UserName,
                 Password = details.Password,
                 AuthenticationType = details.AuthenticationType,
+                ColumnEncryptionSetting = details.ColumnEncryptionSetting,
                 Encrypt = details.Encrypt,
                 TrustServerCertificate = details.TrustServerCertificate,
                 PersistSecurityInfo = details.PersistSecurityInfo,