feat: cars_allowed - update schema (#2083)

* cars_allowed - update schema

Author: qcdyx

main/src/main/java/org/mobilitydata/gtfsvalidator/table/GtfsCarsAllowedEnum.java

@@ -0,0 +1,15 @@
+package org.mobilitydata.gtfsvalidator.table;
+
+import org.mobilitydata.gtfsvalidator.annotation.GtfsEnumValue;
+
+/**
+ * Enum representing the cars_allowed field values.
+ *
+ * <p>0 or empty: No information available about car access for trips associated with this agency or
+ * route. 1: Cars are allowed for trips associated with this agency or route. 2: Cars are not
+ * allowed for trips associated with this agency or route.
+ */
+@GtfsEnumValue(name = "NO_INFORMATION", value = 0)
+@GtfsEnumValue(name = "ALLOWED", value = 1)
+@GtfsEnumValue(name = "NOT_ALLOWED", value = 2)
+public interface GtfsCarsAllowedEnum {}

main/src/main/java/org/mobilitydata/gtfsvalidator/table/GtfsTripSchema.java

@@ -58,4 +58,6 @@ public interface GtfsTripSchema extends GtfsEntity {
   GtfsWheelchairBoarding wheelchairAccessible();
 
   GtfsBikesAllowed bikesAllowed();
+
+  GtfsCarsAllowed carsAllowed();
 }