Update sharing lists to use websocket calls

As seen in attached screenshot, new gui report only 1000 items in the targettoextent view.

Actually, my system has 1589 entries configured :

root@freenas[~]# midclt call iscsi.targetextent.query | jq '. | length'
1589

I'm ok to provide live access to the freenas system, just tell me to provide credentials in a secure way.