[Feature] Support Iceberg tables

[amychen1776]

Is this your first time submitting a feature request?

• I have read the expectations for open source contributors
• I have searched the existing issues, and I could not find an existing issue for this feature
• I am requesting a straightforward extension of existing dbt-postgres functionality, rather than a Big Idea better suited to a discussion

Describe the feature

Creating this issue to track requests for dbt-postgres to support Iceberg tables.
We had a request via dbt Cloud to do so.

Describe alternatives you've considered

No response

Who will this benefit?

All users of Postgres + Iceberg

Are you interested in contributing this feature?

No response

Anything else?

No response