[Feature Request] Add the ephemeral variant of `temporalcloud_apikey`

[aivinog1]

Is your feature request related to a problem? Please describe.

I want to hide the API key completely out of the Terraform state. To do so, there are two features: ephemeral resources and write-only attributes. I want to create ephemeral temporalcloud_apikey and push it in the aws_secretsmanager_secret_version using the write-only attributes such as secret_string_wo and secret_string_wo_version.

Describe the solution you'd like

I can see only one solution - make the ephemeral resource of the API key.

Additional context

You can see the reference here: hashicorp/terraform-provider-tls#637.