proposal for fastcgi_get_status

Hello internals,

I propose to make fpm status accessible to php through a new function
named fastcgi_get_status. The benefits are:

    - developers can combine fpm and application metrics
    - fpm status pages can be written in php
    - fpm status information is available to php

I implemented this in https://github.com/php/php-src/pull/3182

Let me know what you think.

Cheers,
Till