Add Peer dialog hangs on /16 networks

[lesha-co]

Describe The Problem Add Peer dialog hangs on /16 networks

Expected Error / Traceback

No traceback, it just hangs

To Reproduce

• create interface with /16 network
• try to add peer

anyway

https://github.com/donaldzou/WGDashboard/blob/d7d7a84bd5aee496846095c48d638ab46c91958a/src/static/js/configuration.js#L494

this line tries to add 65k elements to the DOM and browsers don't like it one bit

[lesha-co]

optionally cap available_ips to, say, first 1000 elements (easy) or make list virtual (hard but really only viable option to display large lists)