add `status:connected` and `status:hasActivity` to hotspot object

[cokes518]

status;online is no longer a reliable indicator of a Hotspot's "aliveness" nor reflects it's durable connected to a Validator where it is getting its ledger information.

Propose adding a status:connected: yes/no to describe its durable connection with a validator and a status:hasActivity: yes/no based on on-chain activity (can be poc, data transfer).