Add light ids.

PiperOrigin-RevId: 805755907
Change-Id: I92a1b1ea4ce1495c2746fd518f33ab2d1ad81399

python/mujoco/introspect/structs.py

@@ -6697,6 +6697,11 @@ STRUCTS: Mapping[str, StructDecl] = dict([
          name='mjvLight',
          declname='struct mjvLight_',
          fields=(
+             StructFieldDecl(
+                 name='id',
+                 type=ValueType(name='int'),
+                 doc='light id, -1 for headlight',
+             ),
              StructFieldDecl(
                  name='pos',
                  type=ArrayType(

python/mujoco/structs.cc

@@ -1076,6 +1076,7 @@ This is useful for example when the MJB is not available as a file on disk.)"));
       [](MjvLightWrapper& c, decltype(raw::MjvLight::var) rhs) {   \
         c.get()->var = rhs;                                        \
       })
+  X(id);
   X(cutoff);
   X(exponent);
   X(headlight);