Add MaxStaleness to Support Query Acceleration and Object Tables

[modular-magician]

The max_staleness field is used by both External Table Query Acceleration and Object Tables.

Query Acceleration requires the max_staleness field and this PR enables using Terraform to CRUD tables with query acceleration.

A prior contributor added Object Table Support. This PR extends the tests added by including max_staleness.

Changes

• Add max_staleness field: godoc link bq rest api link
• Update: Extended Object Table Tests w/ max_staleness
• Add: Test demonstrating External Table with Query Acceleration

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Generated Terraform providers, and ran make test and make lint in the generated providers to ensure it passes unit and linter tests.
• Ran relevant acceptance tests using my own Google Cloud project and credentials (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read Write release notes before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

bigquery: added `max_staleness` to `google_bigquery_table`

Derived from GoogleCloudPlatform/magic-modules#8509

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