Convert light directional boolean into a type enum.

PiperOrigin-RevId: 761983728
Change-Id: I4d0db5a0f1e8cd4dcd08246b232ddcf2391383ee

Author: DeepMind

dm_control/mjcf/schema.xml

@@ -353,6 +353,7 @@
             <attribute name="mode" type="keyword" valid_values="fixed track trackcom targetbody targetbodycom"/>
             <attribute name="target" type="reference" reference_namespace="body"/>
             <attribute name="directional" type="keyword" valid_values="false true"/>
+            <attribute name="type" type="keyword" valid_values="spot directional point image"/>
             <attribute name="castshadow" type="keyword" valid_values="false true"/>
             <attribute name="active" type="keyword" valid_values="false true"/>
             <attribute name="pos" type="array" array_type="float" array_size="3"/>
@@ -676,6 +677,7 @@
                 <attribute name="mode" type="keyword" valid_values="fixed track trackcom targetbody targetbodycom"/>
                 <attribute name="target" type="reference" reference_namespace="body"/>
                 <attribute name="directional" type="keyword" valid_values="false true"/>
+                <attribute name="type" type="keyword" valid_values="spot directional point image"/>
                 <attribute name="castshadow" type="keyword" valid_values="false true"/>
                 <attribute name="active" type="keyword" valid_values="false true"/>
                 <attribute name="pos" type="array" array_type="float" array_size="3"/>
@@ -1121,6 +1123,7 @@
             <attribute name="mode" type="keyword" valid_values="fixed track trackcom targetbody targetbodycom"/>
             <attribute name="target" type="reference" reference_namespace="body"/>
             <attribute name="directional" type="keyword" valid_values="false true"/>
+            <attribute name="type" type="keyword" valid_values="spot directional point image"/>
             <attribute name="castshadow" type="keyword" valid_values="false true"/>
             <attribute name="active" type="keyword" valid_values="false true"/>
             <attribute name="pos" type="array" array_type="float" array_size="3"/>
@@ -1494,6 +1497,7 @@
                 <attribute name="mode" type="keyword" valid_values="fixed track trackcom targetbody targetbodycom"/>
                 <attribute name="target" type="reference" reference_namespace="body"/>
                 <attribute name="directional" type="keyword" valid_values="false true"/>
+                <attribute name="type" type="keyword" valid_values="spot directional point image"/>
                 <attribute name="castshadow" type="keyword" valid_values="false true"/>
                 <attribute name="active" type="keyword" valid_values="false true"/>
                 <attribute name="pos" type="array" array_type="float" array_size="3"/>