Annotate internal functions with the mixed type

Closes GH-5618

manage ZEND_DEP_FALIAS in gen_stub

Make gen_stub parallelism safe

If PHP-Parser is not yet installed, make sure we don't try to
install it N times in parallel.

Make gen_stub.php compatible with PHP 7.1 again

Not worth bumping requirements over this...

Generate method entries for ext/dom

Closes GH-5374

Fix an undefined class error running gen_stub in php8

For whatever reason, php 8 would not have loaded the subsequent classes when
running `php build/gen_stub.php path/to/filename.php`.

Fix an undefined class error running gen_stub in php8

For whatever reason, php 8 would not have loaded the subsequent classes when
running `php build/gen_stub.php path/to/filename.php`.
I assume it didn't load the classes immediately because there's a possibility
the code before it would throw.
(Probably because __toString was added recently and prevents early binding)

Also, fix a typo

Closes GH-5369

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Generate method entries from stubs for a couple of extensions

Closes GH-5368

Add support for generating method entries from stubs

Closes GH-5363

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal function

Store default parameter values of internal functions in arg info

Closes GH-5353. From now on, PHP will have reflection information
about default values of parameters of internal functions.

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

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Move variable declaration closer to its usage

Improve gen_stub.php

Closes GH-5350
Add support for generating deprecated function entries, as well as forward declaration
of function aliases.

Annotate function aliases in stubs

Verify that all stubs have a return type

Stubs: Store information per-class

We'll need this if we want to generate method entries.

Generate function entries from stubs

If @generate-function-entries is specified in the stub file,
also generate function entries for the extension.

Currently limited to free fun

Generate function entries from stubs

If @generate-function-entries is specified in the stub file,
also generate function entries for the extension.

Currently limited to free functions only.

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Move gen_stub.php to build directory and install it so phpize can take care of it, and thus extension can use it as it is already in Makefile