feat: add contacts liveness service to base layer wallet #3857
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Description
Implemented a liveness service for the base layer wallet's contacts that will send ping messages and respond with pong messages to indicate liveness information.
The next aspect of contacts liveness will be to integrate the events into the various wallet front ends.
Motivation and Context
There is a need to know which managed contacts in a wallet are online and when they have last been seen.
How Has This Been Tested?
[WIP]Additional unit tests