Replaced binary tuple with struct

spec/models.tsp

@@ -0,0 +1,31 @@
+import "@typespec/openapi3";
+using TypeSpec.OpenAPI;
+
+namespace Models;
+
+enum BinaryOperator {
+    AND,
+    OR,
+    IMPLICATION
+}
+
+model ExpressionNot {
+    not: Expression;
+}
+
+model ExpressionBinary {
+    left: Expression;
+    operator: BinaryOperator;
+    right: Expression;
+}
+
+model ExpressionAtomic {
+    atomic: string;
+}
+
+@oneOf
+union Expression {
+    ExpressionNot;
+    ExpressionBinary;
+    ExpressionAtomic;
+}