Terraform-provider-google: Enable use of google_iap_client as a DATASOURCE

[Backstreets]

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Description

I'd like to be able to use a google_iap_client as a datasource, without having to import it to Terraform.
The goal is to avoid destroying the iap client if I do a terraform destroy of my infra.
The info obtained from the datasource (oauth2_client_id, oauth2_client_secret, oauth2_client_secret_sha256) is to be used in the iap block of google_compute_backend_service.

New or Affected Resource(s)

Potential Terraform Configuration

References

https://www.terraform.io/docs/providers/google/r/iap_client.html
https://www.terraform.io/docs/providers/google/r/compute_backend_service.html

Mentioned in:
https://github.com/terraform-providers/terraform-provider-google/issues/6074

We also discussed this briefly in https://github.com/terraform-providers/terraform-provider-google/issues/6074#issuecomment-635506113

[oswalya]

This would really be a helpful implementation.
As long as google does not provide the API to fully automate the oauth2 client configuration, at least with this approach we could reuse the data within our infrastructure automation.

Any news on this so far?

[hadim]

I also could benefit from this in case it helps prioritizing.