API: Expose a GeyserConnection's protocol version (#5083)

* Add protocolVersion() to GeyserConnection

* specify which protocol

api/src/main/java/org/geysermc/geyser/api/connection/GeyserConnection.java

@@ -70,6 +70,11 @@ public interface GeyserConnection extends Connection, CommandSource {
      */
     void closeForm();
 
+    /**
+     * Gets the Bedrock protocol version of the player.
+     */
+    int protocolVersion();
+
     /**
      * @param javaId the Java entity ID to look up.
      * @return a {@link GeyserEntity} if present in this connection's entity tracker.