net: dns: Allow using resolver and responder at the same time

Allow mDNS resolver and responder to to be used at the same
time so that both can use the port 5353. This requires
a DNS traffic dispatcher which affects also the normal DNS
resolver.

Fixes #72553

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
8 files changed