terraform-provider-kubernetes1: Import terraform-provider-kubernetes1 as net/terraform-provider-kubernetes1

Replace net/terraform-provider-kubernetes by adding a suffix version so multiple
kubernetes providers can coexists.

Adapt to terraform/provider.mk so that the provider can be used with
Terraform and OpenTofu.
Please note that now it no longer depends on terraform or opentofu so
the desired version should be manually installed.

Also migrate it to lang/go/go-module.mk.
