Handle keepalives better (Closes #965)

Bedrock cuts off the last 3 digits consistently every time, meaning that the keepalive returned from bedrock is never fully accurate. However, if we multiply the value by 1000, then divide by 1000 when sending back to java, the proper value is returned.

connector/src/main/java/org/geysermc/connector/network/session/GeyserSession.java

@@ -196,12 +196,6 @@ public class GeyserSession implements CommandSender {
     @Setter
     private long lastWindowCloseTime = 0;
 
-    /**
-     * Saves the timestamp of the last keep alive packet
-     */
-    @Setter
-    private long lastKeepAliveTimestamp = 0;
-
     @Setter
     private VillagerTrade[] villagerTrades;
     @Setter

connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockNetworkStackLatencyTranslator.java

@@ -39,8 +39,6 @@ public class BedrockNetworkStackLatencyTranslator extends PacketTranslator<Netwo
 
     @Override
     public void translate(NetworkStackLatencyPacket packet, GeyserSession session) {
-        // The client sends a timestamp back but it's rounded and therefore unreliable when we need the exact number
-        ClientKeepAlivePacket keepAlivePacket = new ClientKeepAlivePacket(session.getLastKeepAliveTimestamp());
-        session.sendDownstreamPacket(keepAlivePacket);
+        session.sendDownstreamPacket(new ClientKeepAlivePacket(packet.getTimestamp() / 1000));
     }
 }

connector/src/main/java/org/geysermc/connector/network/translators/java/JavaKeepAliveTranslator.java

@@ -39,10 +39,9 @@ public class JavaKeepAliveTranslator extends PacketTranslator<ServerKeepAlivePac
 
     @Override
     public void translate(ServerKeepAlivePacket packet, GeyserSession session) {
-        session.setLastKeepAliveTimestamp(packet.getPingId());
         NetworkStackLatencyPacket latencyPacket = new NetworkStackLatencyPacket();
         latencyPacket.setFromServer(true);
-        latencyPacket.setTimestamp(packet.getPingId());
+        latencyPacket.setTimestamp(packet.getPingId() * 1000);
         session.sendUpstreamPacket(latencyPacket);
     }
 }