Move mjtConstraintState from mjmodel.h to mjdata.h.

This is the correct location, this enum is only used in `mjData`, not `mjModel`.

PiperOrigin-RevId: 798860951
Change-Id: I48b9a2afc831bd9a6966cc9586429fd03605bdd2

unity/Runtime/Bindings/MjBindings.cs

@@ -115,6 +115,13 @@ public const int mjVERSION_HEADER = 336;
 
 
 // ------------------------------------Enums------------------------------------
+public enum mjtConstraintState : int{
+  mjCNSTRSTATE_SATISFIED = 0,
+  mjCNSTRSTATE_QUADRATIC = 1,
+  mjCNSTRSTATE_LINEARNEG = 2,
+  mjCNSTRSTATE_LINEARPOS = 3,
+  mjCNSTRSTATE_CONE = 4,
+}
 public enum mjtWarning : int{
   mjWARN_INERTIA = 0,
   mjWARN_CONTACTFULL = 1,
@@ -344,13 +351,6 @@ public enum mjtConstraint : int{
   mjCNSTR_CONTACT_PYRAMIDAL = 6,
   mjCNSTR_CONTACT_ELLIPTIC = 7,
 }
-public enum mjtConstraintState : int{
-  mjCNSTRSTATE_SATISFIED = 0,
-  mjCNSTRSTATE_QUADRATIC = 1,
-  mjCNSTRSTATE_LINEARNEG = 2,
-  mjCNSTRSTATE_LINEARPOS = 3,
-  mjCNSTRSTATE_CONE = 4,
-}
 public enum mjtSensor : int{
   mjSENS_TOUCH = 0,
   mjSENS_ACCELEROMETER = 1,