[Feature] Custom strategy for incremental models when table type is iceberg

[ssulca]

Is this your first time submitting a feature request?

• I have searched the existing issues, and I could not find an existing issue for this feature

Describe the feature

I would like to use a custom merge strategy for incremental models in case of iceber tables.
For example

{{
config(
    unique_key=['id'],
    materialized='incremental',
    table_type='iceberg',
    incremental_strategy='custom_merge',
    ...
)
}}

however, I found a restriction here to do that, and I got

Incremental models on Iceberg tables only work with 'append' or 'merge' (v3 only) strategy.

Is there a main reason for this restriction?

Describe alternatives you've considered

No response

Who will this benefit?

Anyone that want to use a custom strategy for incremental models in iceberg tables.

Are you interested in contributing this feature?

yes

Anything else?

custom strategy