feat(access-token): add ephemeral access-token resource (#1068)

* feat(access-token): add ephemeral access-token resource

Signed-off-by: Mauritz Uphoff <mauritz.uphoff@stackit.cloud>

stackit/internal/services/access_token/testdata/ephemeral_resource.tf

@@ -0,0 +1,15 @@
+variable "default_region" {}
+
+provider "stackit" {
+  default_region        = var.default_region
+  enable_beta_resources = true
+}
+
+ephemeral "stackit_access_token" "example" {}
+
+provider "echo" {
+  data = ephemeral.stackit_access_token.example
+}
+
+resource "echo" "example" {
+}