Mediation webhook routing keys aren't did:keys

[dbluhm]

Just about everywhere else, in the coordinate mediation protocol and manager, we're now handling routing and recipient keys in did:key format. However, webhooks with topic mediation still have routing keys reported as raw base58 encoded public keys. This is occurring at least on the mediation client side.

[dbluhm]

aries_cloudagent.core.event_bus DEBUG Notifying subscribers: <Event topic=acapy::record::mediation::granted, payload={'endpoint': 'http://mediat
or:3000', 'role': 'client', 'state': 'granted', 'created_at': '2023-07-26T19:07:12.663391Z', 'connection_id': '059b2c28-9ba0-476c-8184-718b7af9a676', 'mediator_terms': [], 'mediation_id': '2
c4bee7f-8ba0-49b1-9d4c-09a802a80b2a', 'updated_at': '2023-07-26T19:07:12.774293Z', 'routing_keys': ['DdMf4dzeASFyQ8M16tjKXv6epQMCyeURov7orS9xRk9T'], 'recipient_terms': []}>