fix: only send ip/domain observed address in identify

[achingbrain]

Some addresses are not naturally routable - for example incoming webrtc addresses, so do not send them as observed addresses in identify responses.

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if necessary (this includes comments as well)
• I have added tests that prove my fix is effective or that my feature works