Enhance size estimation for various field types in cost.go

Signed-off-by: maksim.nabokikh <max.nabokih@gmail.com>

pkg/cel/cost.go

@@ -65,8 +65,16 @@ func (defaultCostEstimator) EstimateSize(element checker.AstNode) *checker.SizeE
 			field := path[1]
 			switch field {
 			case "groups", "scopes":
+				// list(string) fields
+				return &checker.SizeEstimate{Min: 0, Max: DefaultListMaxLength}
+			case "email_verified":
+				// bool field — size is always 1
+				return &checker.SizeEstimate{Min: 1, Max: 1}
+			case "redirect_uris":
+				// list(string) field on request
 				return &checker.SizeEstimate{Min: 0, Max: DefaultListMaxLength}
 			default:
+				// string fields (email, username, user_id, client_id, etc.)
 				return &checker.SizeEstimate{Min: 0, Max: DefaultStringMaxLength}
 			}
 		}