Bring back servers_all for now, and add fields for network latency calculations

Author: flyingsilverfin

proto/connection.proto

@@ -18,6 +18,7 @@ message Connection {
     }
 
     message Res {
+      uint64 server_duration_millis = 2;
       ConnectionID connection_id = 1;
       // also: initial Token
     }

proto/transaction.proto

@@ -13,8 +13,7 @@ package typedb.protocol;
 message Transaction {
 
     message Client {
-        bytes connection_id = 1;
-        repeated Req reqs = 2;
+        repeated Req reqs = 1;
     }
 
     message Server {
@@ -68,7 +67,9 @@ message Transaction {
             Options options = 3;
             uint64 network_latency_millis = 4;
         }
-        message Res {}
+        message Res {
+            uint64 server_duration_millis = 2;
+        }
     }
 
     message Commit {

proto/typedb-service.proto

@@ -18,7 +18,7 @@ service TypeDB {
     rpc connection_open (Connection.Open.Req) returns (Connection.Open.Res);
 
 //    // Server Manager API
-//    rpc servers_all (ServerManager.All.Req) returns (ServerManager.All.Res);
+    rpc servers_all (ServerManager.All.Req) returns (ServerManager.All.Res);
 //
 //    // User Manager API
 //    rpc users_contains (UserManager.Contains.Req) returns (UserManager.Contains.Res);