Allow for *-based wildcard exclusion of namespaces

Right now, excluded namespaces work with a 1-1 mapping. That is, if Kubernetes namespace `example-namespace` is in the excluded namespaces configuration, `example-namespace` is excluded from any kubesweeper deletion.

This issue would make it such that users can put `example-*` as an excluded namespace, which would exclude all namespaces that begin with `example-`.

No file or test is named in the issue. Start by locating the excluded namespaces configuration and the filtering used before Kubernetes resources are deleted; trace how exact namespace matches are applied. Done means an exclusion such as example-* prevents deletion for every namespace beginning with example-, while exact exclusions continue to work.

Written by the indexing model from the issue text.