[Feature Request]: Cache the BigQuery table definition instead of calling tables.get() from every worker

### What would you like to happen?

When calling BigQuery's tables.get method, today, we are calling it from every Dataflow worker. This is resulting in customers hitting Quota issues. Please can we cache the Table definition and re-use for all workers instead of calling the method from every worker.

https://cloud.google.com/bigquery/docs/reference/rest/v2/tables/get

https://github.com/apache/beam/blob/9a1e7bf4cd399177e5de7fe28bad741cade452a5/sdks/python/apache_beam/io/gcp/bigquery.py#L902-L903

https://github.com/apache/beam/blob/9a1e7bf4cd399177e5de7fe28bad741cade452a5/sdks/python/apache_beam/io/gcp/bigquery_tools.py#L565

### Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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