Drop serial denier functions

Declare tentative return types for Zend (#7251)

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

Generate zend class entries based on stubs

Closes GH-6685

Fix stub for Serializable::serialize()

This method may also return null.

Update ext/spl parameter names

Closes GH-6284.

Add a few missing parameter types in stubs

Related to GH-5627

Introduce InternalIterator

Userland classes that implement Traversable must do so either
through Iterator or IteratorAggregate. The same requirement does
not exist for internal class

Introduce InternalIterator

Userland classes that implement Traversable must do so either
through Iterator or IteratorAggregate. The same requirement does
not exist for internal classes: They can implement the internal
get_iterator mechanism, without exposing either the Iterator or
IteratorAggregate APIs. This makes them usable in get_iterator(),
but incompatible with any Iterator based APIs.

A lot of internal classes do this, because exposing the userland
APIs is simply a lot of work. This patch alleviates this issue by
providing a generic InternalIterator class, which acts as an
adapater between get_iterator and Iterator, and can be easily
used by many internal classes. At the same time, we extend the
requirement that Traversable implies Iterator or IteratorAggregate
to internal classes as well.

Closes GH-5216.

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Generate method entries from stubs for Zend classes

Closes GH-5459

Add missing visibility modifiers in stubs

Verify that all stubs have a return type

Define Stringable with __toString():string method

Add Zend class/interface arginfo stubs

We also change `Generator::throw()` to expect a `Throwable` in the
first place, and we now throw a TypeError instead of returning `false`
from

Add Zend class/interface arginfo stubs

We also change `Generator::throw()` to expect a `Throwable` in the
first place, and we now throw a TypeError instead of returning `false`
from `Exception::getTraceAsString()`.

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