add api functions for showing/updating/deleting host interfaces

[FStelzer]

adds hostinterface api functions not existing yet.
there's not really much of a choice other than workin directly with the InterfaceIDs for update/delete calls.

[herdir]

Always return an error
user@computer:~$ zabbix-cli -C "show_host_interfaces 507ro1"

[ERROR]:'bulk'

In Zabbix V5 and higher bulk have to be replaced by "details" in hostinterface result

[mbakke]

Hi @FStelzer, do you think you will have the opportunity to adjust this for Zabbix 5 or 6?

Thanks, and sorry for the late response :-)

[FStelzer]

there seemed to be noch much interest for it and i have switched to using the python api directly long ago.
sorry, but at the moment I have other todos and no real use for this functionality.
Shouldn't be too hard to implement though in case someone needs it.