Add data list Networks, List subnets, similar to AWS hashcorp providers

[brunotorrente]

Currently the provider only provides information about a subnet or network if you have their names previously.

My suggestion, add an option similar to another Hashcorp provider ( AWS )

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/subnets

Google API

https://cloud.google.com/compute/docs/reference/rest/v1/subnetworks/list?hl=pt-br

Via Gcloud CLI

gcloud compute networks subnets list --project haha-project-name

[rileykarson]

Closing as a duplicate of #8255

[github-actions]

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