[Network] add ability to retrieve stream metadata

[azjezz]

see : https://www.php.net/manual/en/function.stream-get-meta-data.php

[fredemmott]

retitled:

• a generic thing like that will not be added
• all the other standard documented options are either n/a (e.g. all IO handles are non-blocking, no reads will timeout), or exposed in other ways (e.g. is ReadHandle vs is WriteHandle)

[fredemmott]

actually, closing, that's a PHP implementation detail, also n/a