[RFC] Asymmetric visibility v2 (GH-15063)

Co-authored-by: Larry Garfield <larry@garfieldtech.com>

Zend/tests/asymmetric_visibility/decrease_scope_private_protected.phpt

@@ -0,0 +1,12 @@
+--TEST--
+Asymmetric visibility private(get) protected(set) not allowed
+--FILE--
+<?php
+
+class Foo {
+    private protected(set) string $bar;
+}
+
+?>
+--EXPECTF--
+Fatal error: Visibility of property Foo::$bar must not be weaker than set visibility in %s on line %d