Karaf shell command to enumerate nodes that match a given filter

Add a new Karaf shell command that can be used to enumerate the nodes/interfaces that match a given Filter.

For the matching nodes, the output should include the node label, categories, foreign source/foreign id, along with the matched interfaces.

For the command name, we could use something like: filters:filter - open to other suggestions.

We could also add this command to an existing Maven module such as features/poller/shell instead of creating another one.