Rename zend_error_notify APIs to zend_observer_error* #6131
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My previous PR #4555 introduced a new error notification callback API. After merging #5857 for PHP 8 as well, this PR moves the error notification API into
zend_observer.h
andzend_observer.c
.This will produce a more consistent naming for future, where we provide a general observer API into different parts of PHP engine.
A soft goal would be that we can replace all parts of Dtrace support that are currently hardcoded into the engine using this general observer API provided by
zend_observer.h
at some point in the future, so that dtrace can become an extension instead of being coupled into the engine./cc @morrisonlevi @SammyK