Force delete LXC is not exposed

[adyanth]

While deleting a container, there is a force option that allows a deletion even if the container is running. Please expose this to the Delete() function

https://github.com/luthermonson/go-proxmox/blob/main/containers.go#L32

Reference:
https://pve.proxmox.com/pve-docs/api-viewer/index.html#/nodes/{node}/lxc/{vmid}