profiles and args for k8s

[kobzonega]

1. Args --kubeconfig, --k8s-namespace, --k8s-context (like in kubectl) as optional params
2. Add support thus params inside profile
3. Use default kubeconfig path ~/.kube/config if param is not defined
4. Use current context and namespace from kubeconfig if params is not defined

[Jorres]

The only non-implemented thing from this list is --k8s-context parameter, everything else is implemented just like in this issue

[kobzonega]

The only non-implemented thing from this list is --k8s-context parameter, everything else is implemented just like in this issue

As I understand it, the --k8s-namespace argument is now required with --kubeconfig. Just looking into this code https://github.com/ydb-platform/ydbops/blob/master/pkg/options/targeting.go#L111-L113
I think it should be better to use context with namespace enabled on kubeconfig when it's not overrided by ydbops args