Adds Bigquery datapolicies samples for C.G.C. documentation

[ankitiit84]

Description

Adds Bigquery datapolicies samples for C.G.C. documentation

Checklist

Readiness

• Yes, merge this PR after it is approved
• No, don't merge this PR after it is approved

Style

• My sample follows the rules described for Terraform in the Effective Samples style guide
• My sample follows the other requirements and best practices in the Contributing
  guide

Testing

• I have performed tests described in the Contributing guide:

  • Tests pass: terraform apply
  • Lint pass: terraform fmt check

Intended location

• Yes, this sample will be (or already is) included on cloud.google.com
  Location(s): https://cloud.google.com/bigquery/docs/column-data-masking#work_with_data_policies

• No, this sample won't be included on cloud.google.com
  Reason:

API enablement

• If the sample needs an API enabled to pass testing, I have added the service to the Test setup file

Review

• If this sample adds a new directory, I have added codeowners to the CODEOWNERS file

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• bigquery/datapolicies/create_custom_data_masking_policy/main.tf:16, tag bigquery_datapolicies_create_custom_masking_policy
• bigquery/datapolicies/create_data_policies_with_grantees/main.tf:16, tag bigquery_datapolicies_create_raw_data_access_policy
• bigquery/datapolicies/create_predefined_masking_policy/main.tf:16, tag bigquery_datapolicies_create_predefined_masking_policy
• bigquery/datapolicies/create_raw_data_access_policy/main.tf:16, tag bigquery_datapolicies_create_raw_data_access_policy

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