Add ReflectionFiber

Add self-contained CURL example

Add read/write to loop and examples

Update tests SKIPIF

Remove references to await in tests

Remove unnecessary temp zval

Update TimerQueue

Import fixes made in Amp.

Remove unnecessary error observer

This was made unnecessary by the change in zend_fiber_observer_end to skip finishing schedulers if EG(exception) is not null.

Fatal error if fiber throws an exception

Rename continued to isPending

Remove unused string

Free unstarted fiber stack

Add Continuation object

Fix incorrect arginfo

Use zend_execute_ex instead of execute_ex

Allows extensions setting this pointer to work in fibers.

Add second ref to root fiber to prevent GC

Better handling of exceptions thrown during shutdown

Drop Awaitable interface

Add Fiber::run() throw tests

Swap exception type on await during shutdown

Move where shutdown flag is set

Remove set but unused variable

Remove unnecessary macro

Not needed with PHP 8.

Forbid awaiting after shutdown

Cleanup fatal error / shutdown flags