[reSIProcate] more of ServerAuthManager - flagging successful credentials?

[Daniel Pocock <daniel@xxxxxxxxxxxxxxxxxxxxx>]

I notice that ServerAuthManager doesn't currently provide a mechanism 
with which to annotate a SipMessage with the credential that has been 
verified successfully. 

The ProxyAuthorization header contains the raw data submitted with the 
packet, is there a way for methods like 
InviteSessionHandler::onNewInviteSession to know which of these 
credentials was validated successfully by ServerAuthManager?

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