moved MonoBehaviours into perception add component menu

com.unity.perception/Runtime/GroundTruth/Labelers/JointLabel.cs

     /// Label to designate a custom joint/keypoint. These are needed to add body
     /// parts to a humanoid model that are not contained in its <see cref="Animator"/> <see cref="Avatar"/>
     /// </summary>
+    [AddComponentMenu("Perception/Joint Label")]
     public class JointLabel : MonoBehaviour
     {
         /// <summary>

com.unity.perception/Runtime/GroundTruth/Labeling/Labeling.cs

     /// <summary>
     /// Defines a set of labels associated with the object and its descendants. A Labeling component will override any Labeling components on the object's ancestors.
     /// </summary>
+    [AddComponentMenu("Perception/Joint Label")]
     public class Labeling : MonoBehaviour
     {
         /// <summary>