JDBC sink uses schema's default value when provided and field value is NULL

If a field's schema defines a default value but the inserted value is null, the JDBC sink connector is binding the default value rather than null. See zulip conversation - https://debezium.zulipchat.com/#narrow/stream/383534-community-jdbc/topic/postgres.20.20default.20value.20field.20issue/near/424999109