Support terraform provider actions #3230
Description
Terraform is adding a new concept "actions" to allow providers to declare operations supported by that provider: https://developer.hashicorp.com/terraform/language/v1.14.x/invoke-actions?product_intent=terraform
We will probably want to expose these actions in the bridge so users can make use of these in Pulumi programs as well. It looks like they could be exposed as invokes + using the new support from the engine to tell if an invoke is happening at planning/preview time (pulumi/pulumi#20827).