Add user options for configuring proxmox

[SpiderUnderUrBed]

Currently, it is not enough to simply create a Linux user and have it work in proxmox, the only workaround I can think of was to give my root user a explicit password, I am using a live-boot for this, so this is not preferable, but in more normal use cases some people would simply like their regular users to be usable on proxmox as soon as they get on the webpage. Creating a simple user will not make it work in proxmox, I will again, have to log into the webui with root, then go to Datacenter -> Permissions -> Users -> Add. Adding the ability for users to be configured will allow my system to be declaritive enough so, I can setup the rest with scripts or with ansible, logging into said users, which is why I think this should be a priority. The actual implementation I haven't thought too much on, but essentially something that tells proxmox which user has which permission or just creates the user.