Create table `cluster by` expression support

[rampage644]

Currently, cluster by clause in create and alter table statement only supports comma separated list of identifiers (https://github.com/apache/datafusion-sqlparser-rs/blob/84c3a1b325c39c879b68ab712e3b9b3e3e40ed56/src/dialect/snowflake.rs#L452), whereas snowflake supports having expressions there:

create or replace iceberg table snowplow.public_snowplow_manifest.snowplow_web_base_sessions_lifecycle_manifest
    cluster by (to_date(start_tstamp))

[rampage644]

It helps to disable cluster by statement for models with macros override:

{% macro default__web_cluster_by_fields_sessions_lifecycle() %}
  {{ return(snowplow_utils.get_value_by_target_type(bigquery_val=["session_identifier"], snowflake_val=None)) }}
{% endmacro %}

{% macro default__web_cluster_by_fields_page_views() %}
  {{ return(snowplow_utils.get_value_by_target_type(bigquery_val=["domain_userid","domain_sessionid"], snowflake_val=None)) }}
{% endmacro %}

{% macro default__web_cluster_by_fields_sessions() %}
  {{ return(snowplow_utils.get_value_by_target_type(bigquery_val=["domain_userid"], snowflake_val=None)) }}
{% endmacro %}

{% macro default__web_cluster_by_fields_users() %}
  {{ return(snowplow_utils.get_value_by_target_type(bigquery_val=["user_id","domain_userid"], snowflake_val=None)) }}
{% endmacro %}

{% macro default__web_cluster_by_fields_consent() %}
  {{ return(snowplow_utils.get_value_by_target_type(bigquery_val=["event_id","domain_userid"], snowflake_val=None)) }}
{% endmacro %}

{% macro default__web_cluster_by_fields_cwv() %}
  {{ return(snowplow_utils.get_value_by_target_type(bigquery_val=["page_view_id","domain_userid"], snowflake_val=None)) }}
{% endmacro %}