feat: update expressions.

bin/expressions/src/evaluator.dart

@@ -122,6 +122,10 @@ class ExpressionEvaluator {
         return left / right();
       case '%':
         return left % right();
+      case 'in':
+        return (right() as List).contains(left);
+      case 'notIn':
+        return !(right() as List).contains(left);
     }
     throw ArgumentError(
         'Unknown operator ${expression.operator} in expression');

bin/expressions/src/parser.dart

@@ -123,7 +123,9 @@ class ExpressionParser {
     '-': 9,
     '*': 10,
     '/': 10,
-    '%': 10
+    '%': 10,
+    'in': 11,
+    'notIn': 11,
   };
 
   // This function is responsible for gobbling an individual expression,