Generate optimizer func info from stubs for various extensions (#7409)

ext/hash, ext/iconv, ext/mbstring, ext/xml, ext/zlib

Add support for generating optimizer function info from stubs (#7367)

Not serializable flag permeation

Generate class entries from stubs for com, standard, xmlreader, xmlwriter, xsl, zip, Zend

Closes GH-6706

Sync gzgets signature with fgets

Verify parameter names of function aliases

Closes GH-6335

Update ext/sockets parameter names

Also change $max_length to $length in a number of filesystem APIs,
where our usage was inconsistent.

Closes GH-6276.

Review parameter names in ext/zlib

Closes GH-6250

Fix UNKNOWN default values in ext/standard

Closes GH-6026

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necess

Include stub hash in generated arginfo files

The hash is used to check whether the arginfo file needs to be
regenerated. PHP-Parser will only be downloaded if this is actually
necessary.

This ensures that release artifacts will never try to regenerate
stubs and thus fetch PHP-Parser, as long as you do not modify any
files.

Closes GH-5739.

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Convert resources to objects in ext/zlib

Closes GH-5680

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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Generate function entries for another batch of extensions

Closes GH-5352

Convert some warnings to Error in zlib extension

Closes GH-4985

Add union return types for function stubs

Add stub for ext zlib