Directory Replication Service

[bbengfort]

Create a directory replication service in the protocol buffers that allows the anti-entropy exchange of directory entries specified by the version number in each VASP. This will allow a directory service mesh to be created across different providers. Note on the replication:

• The replication service must be authenticated with mTLS
• Periodic anti-entropy sessions should be conducted by randomly selecting another peer
• Anti-entropy is bilateral (push current versions, receive changes, send changes)
• Peers should also be exchanged during anti-entropy