Alter table operations at runtime may break connector

[Bouncheck]

Steps to reproduce:

1. Create a Scylla cluster, create a table, insert enough data to generate a substantial amount of CDC logs or setup an application that will continuously generate some data.
2. Setup the CDC connector to read from that table
3. While the data is being processed by connector perform ALTER TABLE that removes a column from the base table.

What is very likely to happen is that the connector will fetch a new record before it learns that the schema has changed. In such case a restart is needed.