In the summary show, also print the browser link.

Right now the summary table print looks like this

```
$ wavectl show alert
ID NAME STATUS SEVERITY
1523082347619 Kubernetes - Node Network Utilization - HIGH (Prod) CHECKING WARN
1523082347824 Kubernetes - Node Cpu Utilization - HIGH (Prod) CHECKING WARN
1523082348005 Kubernetes - Node Memory Swap Utilization - HIGH (Prod) SNOOZED WARN
...
```

It would be very useful to add a URL column to this.

```
URL
https://acme.wavefron.com/alerts/1523082347619
```

This extra command can be added by default to the summary output format. Or we could add a -o wide option a wide output format.

Same holds for the dashboards too. The dashboard summary table can also get a URL column