Add some more flows (#4659)
Add some more flows (#4659)

* Add some more flows

- Adds all relevant JSON flows https://www.php.net/manual/en/ref.json.php
- Adds all relevant misc flows https://www.php.net/manual/en/ref.misc.php
- Adds a small subset of URL flows https://www.php.net/manual/en/ref.url.php

* Update CoreGenericFunctions.phpstub
vimeo/psalm,vimeo/psalm