[new-feature]: pjsip show contact -- show all details same as AMI PJSIPShowContacts

[Mark Murawski]

Feature Description

Not much to this one. CLI 'pjsip show contact' does not show enough information.
One must telnet to AMI or write a script to ask asterisk for example what the User-Agent is on a Contact
This feature adds the same details as PJSIPShowContacts to the CLI

[Mark Murawski]

Code in: #644