[hal] Add high level way of getting systemserver NT instance (#7683)

ntcore/src/generated/main/java/edu/wpi/first/networktables/NetworkTableInstance.java

@@ -134,6 +134,16 @@ public final class NetworkTableInstance implements AutoCloseable {
     return inst;
   }
 
+  /**
+   * Create an instance from a native handle. This instance is not owned, closing will do nothing.
+   *
+   * @param handle Native instance handle
+   * @return Instance
+   */
+  public static NetworkTableInstance fromNativeHandle(int handle) {
+    return new NetworkTableInstance(handle);
+  }
+
   /**
    * Gets the native handle for the instance.
    *