Add Kubernetes objectStorage Recipe - Terraform

Overview of the Resource type and Recipe

Radius.Storage/objectStorage only has an Azure recipe today. Create a Kubernetes Recipe in Terraform using an S3-compatible store.

Acceptance criteria

1. A Kubernetes Terraform recipe at Storage/objectStorage/recipes/kubernetes/terraform/ (e.g. MinIO + PVC) creating the containerName bucket.
2. Emits the Radius result object with the resource type's outputs.
3. Recipe entry added to the default Kubernetes recipe pack (recipepack/kubernetes/default-recipepack.bicep).
4. README; manual testing with make test-recipe.

Additional context

Example: Data/postgreSqlDatabases/recipes/kubernetes/terraform/; contribution guide docs/contributing/contributing-resource-types-recipes.md.