Show only objects older than a specific amount of time

[dudicoco]

Hi,

One great use of this tool would be to garbage collect versioned configmaps, similar to the example output in the readme:

$ untrak -c untrak.yaml -o text
- api/ConfigMap/django-config-b4k42gm792
- api/ConfigMap/django-config-g55mctg456

Sometimes though, this might output configmaps which are still in use (perhaps as part of a rolling update), but are no longer in the scm (for example, when using the helm.sh/resource-policy: keep annotation).

I suggest adding a parameter to show objects only older than a a specified amount of days.

Thanks!