No way to share Designate Zones with other projects

The OpenStack provider doesn't include a resource to create a zone sharing. This can be done on the CLI via:
openstack zone share create <zone_id> <project_id>

When creating a zone, it is created in the project context the creation is run in, or whichever project is specified via project_id. If you want to use the zone across multiple projects, there's currently no way to create and manage these shares via Terraform.