Update protocol (for Grakn Cluster) (#6156)
Update protocol (for Grakn Cluster) (#6156)

## What is the goal of this PR?

We updated the protobuf definitions for use by Grakn Cluster.

## What are the changes implemented in this PR?

Update protocol

## Additional information

This protocol change only affects Grakn Cluster. Core itself is unaffected.
graknlabs/grakn,lolski/grakn,graknlabs/grakn,lolski/grakn,graknlabs/grakn,lolski/grakn,graknlabs/grakn,lolski/grakn