getinfo: provide info which auth was used for HTTP and proxy

CURLINFO_HTTPAUTH_USED and CURLINFO_PROXYAUTH_USED

Tested in 590 and 694

Ref: #12668
Idea-by: Ganesh Viswan

getinfo: provide info which auth was used for HTTP and proxy

CURLINFO_HTTPAUTH_USED and CURLINFO_PROXYAUTH_USED

Tested in 590 and 694

Ref: #12668
Idea-by: Ganesh Viswanathan
Closes #15450

show more ...