Add table maintenance for iceberg table format

[cccs-jc]

spark-utils has table maintenance macros for DeltaLake tables.

For example these macros list the tables in a schema and perform vacuum. https://github.com/dbt-labs/spark-utils/blob/b41aab4e63acb205d11bf80e2a7bbe0dd63a3c6f/macros/maintenance_operation.sql

In the same manner, it would be great if spark-utils also had support for Iceberg table maintenance.

https://iceberg.apache.org/docs/latest/spark-procedures/#metadata-management Examples of maintenance could be

• expire_snapshots
• remove_orphan_files
• rewrite_data_files
• rewrite_manifests