SPIKE - BigQuery support for iceberg materialisations

[borjavb]

resolves #1370

Problem

Bigquery has now support for native iceberg tables

Solution

Very naive approximation on how this could look like. We support both incrementality + the desired table format.

{{ config(
    materialized="incremental",
    table_format="iceberg",
    base_location = "location"
)
}}

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX

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[cla-bot]

Thanks for your pull request, and welcome to our community! We require contributors to sign our Contributor License Agreement and we don't seem to have your signature on file. Check out this article for more information on why we have a CLA.

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