Fix various hooked object iterator issues

Fixes GH-16185
Closes GH-16281

Deny resetting an object as lazy during property iteration

Supporting object reset while its properties are being iterated would increase
complexity for little benefit. Furthermore it ma

Deny resetting an object as lazy during property iteration

Supporting object reset while its properties are being iterated would increase
complexity for little benefit. Furthermore it may not be possible to ensure a
consistent behavior between ghosts and proxies (wrt to iteration position).

Iteration is detected by checking if the object's properties ht has iterators.
This requires refactoring the hooked get_iterator() implementation to ensure
that it creates a properties ht iterator immediately.

Closes GH-15960

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Fix handling of undef property during foreach by ref on hooked class

Fix oss-fuzz #71382 (#15854)

The return value of zho_build_properties_ex() is passed to ZVAL_ARR(), which sets the IS_TYPE_REFCOUNTED flag. Returning &zend_emtpy_array will crash later when

Fix oss-fuzz #71382 (#15854)

The return value of zho_build_properties_ex() is passed to ZVAL_ARR(), which sets the IS_TYPE_REFCOUNTED flag. Returning &zend_emtpy_array will crash later when trying to dtor the zval.

I'm fixing this by returning zend_new_array(0) instead of &zend_empty_array.

An alternative was to make ZVAL_ARR() aware of immutable arrays, like ZVAL_STR() is with interned strings, but I found no other problematic cases.

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Lazy objects

RFC: https://wiki.php.net/rfc/lazy-objects

Closes GH-15019

Replace OBJ_PROP_PTR_TO_NUM() with zend_get_property_info_for_slot()

I wasn't aware such a function already existed.

Fix various hooked object iterator issues (GH-15394)

Fixes GH-15187

[RFC] Property hooks (#13455)

RFC: https://wiki.php.net/rfc/property-hooks

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>