feat(native): add native property assignment operation with class constant

- Introduce NativePropertyAssignOpClassConstBox class with flags property
- Implement clearPublic method using bitwise AND assignment operator
- Add native_property_assign_op_class_const function for testing
- Demonstrate bitwise operation with ReflectionClassConstant::IS_PUBLIC
- Support integer type declaration for flags property
- Enable

phpunit/code/native-property-assign-op-class-const.php

@@ -0,0 +1,18 @@
+<?php
+
+class NativePropertyAssignOpClassConstBox
+{
+    public int $flags = 7;
+
+    public function clearPublic(): int
+    {
+        $this->flags &= ~ReflectionClassConstant::IS_PUBLIC;
+        return $this->flags;
+    }
+}
+
+function native_property_assign_op_class_const(): int
+{
+    $box = new NativePropertyAssignOpClassConstBox();
+    return $box->clearPublic();
+}