Enable authorization of materialized views

[kubikb]

resolves #773.

Problem

Similarly to BigQuery views, BigQuery materialized views can also be authorized to access the data in another dataset(s). However, providing the grant_access_to configuration to a model with materialized_view materialization goes silently ignored and the materialized view does NOT get authorized to access data in another dataset. With models with view materialization, the grant_access_to configuration leads to the desired behavior, namely the view gets authorized to access data in another dataset.

Solution

This pull request add logic to handle the config grant_access_to also for models with materialization materialized_view. The PR also extends currently existing tests.

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

Moved from dbt-labs/dbt-bigquery#1470

[kubikb]

An unrelated integration test fails. My changes didn't alter the behavior tested by the integration test tests/functional/adapter/test_basic.py::TestDocsGenerateBigQuery::test_run_and_generate_no_compile.