[SG-72] Sync changed email address with stripe (#2042)

* sync changed email address with strip

* sync changed email address with strip

* fixed formatting

* throw exception if not successful

* Added revert if stripe sync fails

* Added revert if stripe sync fails

* Added revert if stripe sync fails

* created stripe sync service

* fixed lint issue

* reverted to use stripe exception message

* added null checks to customer id and email address

* added braces

* removed empty email

src/Core/Exceptions/InvalidGatewayCustomerIdException.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace Bit.Core.Exceptions
+{
+    public class InvalidGatewayCustomerIdException : Exception
+    {
+        public InvalidGatewayCustomerIdException()
+            : base("Invalid gateway customerId.")
+        {
+
+        }
+    }
+}