feat: add force_batch to iceberg_merge and incremental_insert

[Danya-Fpnk]

Description

Resolves: #481

Add force_batch to iceberg_merge and incremental_insert

Models used to test

{{ config(
        materialized='incremental',
        incremental_strategy='append',
        partitioned_by=['date_column'],
        force_batch=true
    )
}}

select
    random() as rnd,
    cast(date_column as date) as date_column
from (
    values (
        sequence(from_iso8601_date('2023-01-01'), from_iso8601_date('2023-07-31'), interval '1' day)
    )
) as t1(date_array)
cross join unnest(date_array) as t2(date_column)

{{ config(
        table_type='iceberg',
        materialized='incremental',
        incremental_strategy='merge',
        unique_key=['date_column'],
        partitioned_by=['date_column'],
        force_batch=true
    )
}}

{% if is_incremental() %}
    select
        1 as rnd,
        cast(date_column as date) as date_column
    from (
        values (
            sequence(from_iso8601_date('2023-01-01'), from_iso8601_date('2023-07-31'), interval '1' day)
        )
    ) as t1(date_array)
    cross join unnest(date_array) as t2(date_column)
{% else %}
    select
        2 as rnd,
        cast(date_column as date) as date_column
    from (
        values (
            sequence(from_iso8601_date('2023-01-01'), from_iso8601_date('2023-07-31'), interval '1' day)
        )
    ) as t1(date_array)
    cross join unnest(date_array) as t2(date_column)
{% endif %}

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

[svdimchenko]

solid job done 💪

[nicor88]

Great job 💯