Add data source for retrieving multiple GCS buckets from a project

[bestefreund]

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Description

Add data source for retrieving multiple GCS buckets from a project

New or Affected Resource(s)

• data_google_storage_buckets

Potential Terraform Configuration

data "google_storage_buckets" "example" {
  project = "example-project"
}

References

• https://cloud.google.com/storage/docs/json_api/v1/buckets/list
• https://cloud.google.com/storage/docs/json_api/v1/buckets#resource

b/334942101

[SarahFrench]

Note from triage: It'd be good to support the prefix filter initially, but this is stuff that could be added later too

[bestefreund]

Note from triage: It'd be good to support the prefix filter initially, but this is stuff that could be added later too

The prefix attribute is already supported:
https://github.com/GoogleCloudPlatform/magic-modules/pull/10444/files

[github-actions]

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