feat: add iceberg sync column types support

[sashakcc]

Description

Add support of sync column type for iceberg tables using general method of altering column type with steps:

1. Add a new temporary column with new type
2. Copy data from column with old type
3. Drop the existing column
4. Rename the new column to existing column

Model example

{{
   config(
        materialized='incremental',
        incremental_strategy='append',
        on_schema_change='sync_all_columns',
        table_type='iceberg',
   )
}}

select cast(150.5 as decimal(26,15)) as amount
     , cast('10.1' as varchar) as user_id
     , cast('14.123456789' as double) as amount_double
     , cast('2023-05-01' as date) as reg_date
     , cast('2023-05-01 13:45:00.123456' as timestamp(6)) as ts
;

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]

@sashakcc the code looks good to me, great job done 💪 @Jrmyy pls take a look at this PR
is it possible to cover these changes with functional tests ?