Add missing mysqlnd checks to stubs

Promote warnings to Error in MySQLi extension

Closes GH-5803

Remove dummy aliases for mysqli constructors

These are only available as methods. Directly declare them as
such instead of aliasing to functions that don't actually exist.

Add another round of missing parameter types to stubs

Closes GH-5950

Add a few missing parameter types in stubs

Related to GH-5627

Fix arg/func info

* mysqli_get_server_info() cannot return null. The underlying API
is infallible.
* mysqli_select_db() func info is redundant.
* mb_detect_order() can only

Fix arg/func info

* mysqli_get_server_info() cannot return null. The underlying API
is infallible.
* mysqli_select_db() func info is redundant.
* mb_detect_order() can only return array|true, not array|false.

Also make the func_info.phpt test that is supposed to catch these
kinds of issues actually work.

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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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Fix some UNKNOWN default values

In ext/ffi, ext/intl, ext/mysqli, and ext/pcntl

Annotate internal functions with the mixed type

Closes GH-5618

Fix some final classes in stubs

Fix UNKNOWN default values in various extensions

Closes GH-5514

Remove support for libmysqlclient 5.0

Closes GH-5391.

Generate function entries from stubs for mysqli
Closes GH-5420

Fix default value of the $class_name parameter of mysqli_fetch_object()

Fix the default value of the $flags parameter of mysqli_begin_transaction()

Add missing parameter to the stub of mysqli_real_connect

Fix mysqli_get_client_info() stub

The dummy link argument is not nullable.

Annotate function aliases in stubs

Do not include the same stub multiple times

Closes GH-5322

Update MySQLi function info

Closes GH-5214

Add ext/mysqli stubs

Closes GH-4913.