fix: add varbinary column type for iceberg tables

[sashakcc]

Description

Fix error while executing sql query for adding varbinary column for iceberg tables:

alter table db_schema.table add columns (test_column varbinary);

Added: replace ddl column type for iceberg table from varbinary to binary.

Checklist

• You followed contributing section
• You kept your Pull Request small and focused on a single feature or bug fix.
• You added unit testing when necessary
• You added functional testing when necessary