visualize qemu vm statistics in real-time

### Description

We (w/@dentrax) thought it'd be good to create a sub-command like `stats` which would display the VM statistics in real-time as the docker's stats command.

```shell
# can take a VM name as an argument or will list all the VM stats if no VM name is given
$ limactl stats
NAME CPUS MEMORY DISK
vbox %13 %27 %31
```