[grid] Make NodeId, Session and Session id serializable

Author: pujagani

java/client/src/org/openqa/selenium/remote/SessionId.java

@@ -20,10 +20,11 @@
 import org.openqa.selenium.internal.Require;
 import org.openqa.selenium.json.JsonException;
 
+import java.io.Serializable;
 import java.util.Map;
 import java.util.UUID;
 
-public class SessionId {
+public class SessionId implements Serializable {
 
   private final String opaqueKey;
 

java/server/src/org/openqa/selenium/grid/data/NodeId.java

@@ -19,11 +19,12 @@
 
 import org.openqa.selenium.internal.Require;
 
+import java.io.Serializable;
 import java.util.Comparator;
 import java.util.Objects;
 import java.util.UUID;
 
-public class NodeId implements Comparable<NodeId> {
+public class NodeId implements Comparable<NodeId>, Serializable {
 
   private final UUID uuid;
 

java/server/src/org/openqa/selenium/grid/data/Session.java

@@ -23,6 +23,7 @@
 import org.openqa.selenium.json.JsonInput;
 import org.openqa.selenium.remote.SessionId;
 
+import java.io.Serializable;
 import java.net.URI;
 import java.time.Instant;
 import java.util.Map;
@@ -36,7 +37,7 @@
  * The serialized form is designed to mimic that of the return value of the New Session command, but
  * an additional {@code uri} field must also be present.
  */
-public class Session {
+public class Session implements Serializable {
 
   private final SessionId id;
   private final URI uri;