RFE: lift root requirements for some bootc commands

Feel free to push back on this, but there are a number of rpm-ostree commands that can be run w/o sudo access. `rpm-ostree status` is what comes to mind. I believe we have policykit (or something like that!) to enable certain commands from non-privileged users. It would be nice if we could do the same for bootc.

I *think* we want any user w/ shell access to be able to querry:

```
$ bootc status
ERROR Status: Querying root privilege: This command requires root privileges
```

Thoughts?