Support dynamic timestamp args in Iceberg CALL

[wangyum]

Feature Request / Improvement

To support:

CALL DSv2HmsCatalog.system.expire_snapshots(                                                                                                                                                           
  table => 'db.table',
  older_than => CURRENT_TIMESTAMP() - INTERVAL 2 DAYS,                                                                                                                                                           
  retain_last => 1,
  except_replace_snapshot => false                                                                                                                                                                      
);

Query engine

Spark

Willingness to contribute

• I can contribute this improvement/feature independently
• I would be willing to contribute this improvement/feature with guidance from the Iceberg community
• I cannot contribute this improvement/feature at this time