Sniff all cURL requests

[xepozz]

One way it to handle all cURL requests inside third-party libraries is to proxy all of them through internal wrapper with global stream/curl context.
See:

yii-debug/src/Collector/HttpStreamCollector.php

Line 26 in 71f6553

// TODO: add cURL support, maybe through proxy?

It's impossible to do it now because PHP doesn't support it. php/php-src#10509