How to set vm.memory with firecracker-ctr ?

```bash
# start a container with command
firecracker-ctr run --rm --tty --net-host --memory-limit 1073741824 docker.io/amd64/ubuntu c1 bash

root@microvm:/# free -m
total used free shared buffers cached
Mem: 112 88 23 0 17 46
```

`CreateVM` ignore any paramaters and I want to know how to enlarge my container's memory, looks like which control by `MemSizeMib` insteadof `memory-limit`

https://github.com/firecracker-microvm/firecracker-containerd/blob/301f04bdccf375909ba273371ab4124b5def264e/runtime/service.go#L373-L377