[Feature request] Native support to disable mon service through command

Now if I want to disable the mon service on one of the node in the cluster, I have to

```
sudo snap stop --disable microceph.mon

# Show rows in sql
sudo microceph cluster sql "SELECT * from services"
sudo microceph cluster sql "SELECT * from config"

# Replace the following id with the one that you want to delete"
sudo microceph cluster sql "DELETE from services where id=14"
sudo microceph cluster sql "DELETE from config where id=7"

# Remove mon through ceph command
sudo ceph mon rm {mon-name}
```

Which is not user-friendly and not well-documented. It will be nice if microceph can support command to disable mon service like `sudo microceph disable mon`.