Add support for quota project on BigQuery

[Kayrnt]

What's a quota project?

BigQuery allows to have custom quotas: https://cloud.google.com/bigquery/docs/custom-quotas
For instance, it allows to control the amount of TB that can be queried per user.

What's the default?

The default appears to be quota project_id from the credentials such as in JSON credentials:

{
  "account": "",
  "client_id": "xyz.apps.googleusercontent.com",
  "client_secret": "xyz",
  "quota_project_id":  "my_quota_project",
  "refresh_token": "xyz",
  "type": "authorized_user",
  "universe_domain": "googleapis.com"
}

How it is used?

The BigQuery client from Python SDK has a property that allows to override the quota_project through client_options.
The option is used in https://github.com/googleapis/python-cloud-core/blob/e5fb3ea79ea70d538a97c758a33d0b3ab7d1182c/google/cloud/client/__init__.py#L184-L187