Add the `--tags` flag to `clan machines list`
This now supports the machine tagging system from the inventory.
Multiple tags are the intersection of the tags of a specific machine.
Example two machines with overlapping tags:
```
server: ["intel"]
laptop: ["intel", "graphical"]
```
- `clan machines list --tags intel` will output:
```
server
laptop
```
- `clan machines list --tags intel graphical` will output:
```
laptop
```
- `clan machines list --tags graphical` will output:
```
laptop
```
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