1. Proposed title of this feature request

Ability to create private gcp bucket with using CCOCTL gcp create command

2. What is the nature and description of the request?

When running ccoctl gcp create command, it creates a public gcp bucket for OIDC provider.

As of now, only aws support creating of private S3 bucket when running ccoctl aws create.

ccoctl aws create-all \
  --name=<name> \
  --region=<aws_region> \
  --credentials-requests-dir=<path_to_credentials_requests_directory> \
  --output-dir=<path_to_ccoctl_output_dir> \
  --create-private-s3-bucket 

 [1]https://docs.openshift.com/container-platform/4.15/installing/installing_aws/installing-aws-customizations.html#installing-aws-with-short-term-creds_installing-aws-customizations

Need similar option for GCP cloud services. 

3. Why does the customer need this? (List the business requirements here)

At customer's environment, creating public bucket is against the policy.

4. List any affected packages or components.

ccoctl binary