Add support for OCI Registry feed

[denys-octopus]

Add support for OCI (Open Container Initiative) Registry feed

resource "octopusdeploy_oci_registry_feed" "example" {
  feed_uri = "oci://test-registry.docker.io"
  password = "test-password"
  name = "Test oci Registry Feed (OK to Delete)"
  username = "test-username"
}

closes #543

[domenicsim1]

looks good, good to merge after go-octopusdeploy dependency is updated