Fix GH-10377: Unable to have an anonymous readonly class

This fixes the oversight that an anonymous class should be able to be
readonly. Other identifiers such as final and abstract do n

Fix GH-10377: Unable to have an anonymous readonly class

This fixes the oversight that an anonymous class should be able to be
readonly. Other identifiers such as final and abstract do not make
sense. As we still want nice errors for when users try to use these
modifiers, or use multiple modifiers, we introduce a new function
zend_add_anonymous_class_modifier that will perform verification for
anonymous class modifiers, just like zend_add_class_modifier does for
non-anonymous classes.

Closes GH-10381

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