Enhance DNSResolver by exposing more params from resolution

[jaimecasero]

Params like TTL are hidden during resolution, since the returned class is Hop. Hop is a limited class specifically oriented to internal stack routing.

Here we may devise two different options:
-Create a HopExt class to include new params by proper getter/setter.
-Use URI natively, and reuse URI param capabilities so apps get all params transparently.

JAIN-SIP.ext has been traditionally oriented to extend the JAIN SIP stack itself, but its been incorporating features for Applications lately. This criteria may be used to design API to incorporate this new feature...