Support Zenoh key filtering in Zenoh router

[evshary]

Describe the feature

In the uProtocol world, there are two kinds of traffic, local and remote.
The local traffic is within the machine, which use the Zenoh key with the prefix upl/
The remote traffic is to send messages outside the machine, which use the Zenoh key with the prefix upr/
Every machine has one Zenoh router, and the remote traffic should pass via the router.
The requirement is that we don't want the local traffic can pass via the Zenoh router.
That means the Zenoh key with the prefix "upl/" is not visible by other machine.
I think it's related to the ACL configuration on Zenoh router, but need more investigation.

@stevenhartley Could you please share the diagram you showed yesterday? It would also be better if you could take an actual user case to describe the scenario. Thank you!

[evshary]

As we concluded here, we don't need Zenoh Key filtering anymore in the Zenoh router. Let me close the issue.