Support terraform ephemeral resources #3231
Description
Along with write-only properties (which pulumi just bridges as secrets) Terraform has also added the concept of ephemeral resources: https://developer.hashicorp.com/terraform/language/manage-sensitive-data/ephemeral
These are actually more like data sources than resources, but with a bit of a lifetime (they can be renewed and closed). It looks like these should be possible to expose as invokes with a little bit of lifecycle tracking kept inside the provider (the engine promises provider processes that they can be stateful, so this should be ok).