Allow selecting server IPv4 or IPv6 for

[hsnelamir]

Its very common when it comes to crawling to use proxies,
however its also feasible to do so when the server come with multiple IPv4 or IPv6 subnets
https://stackoverflow.com/questions/2425651/select-outgoing-ip-for-curl-request

i guess we can edit http-client-curl/src/CurlClient.php and serps/core/src/Core/Http/Proxy.php
to add another case with proxy type as 'iface'

while using below curl options

(CURLOPT_INTERFACE, 'IP');
(CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);