Create, view, and manage log alerts

Metric alerts can be managed with `az monitor metrics alert`:
```
az monitor metrics alert -h

Group
az monitor metrics alert : Manage near-realtime metric alert rules.

Commands:
create : Create a metric-based alert rule.
delete : Delete a metrics-based alert rule.
list : List metric-based alert rules.
show : Show a metrics-based alert rule.
update : Update a metric-based alert rule.
```

I want the same thing for **log alerts**.

Metric alerts has:

Create, view, and manage metric alerts using Azure Monitor
https://docs.microsoft.com/en-us/azure/azure-monitor/platform/alerts-metric

Log alerts has:

Create, view, and manage log alerts using Azure Monitor
https://docs.microsoft.com/en-us/azure/azure-monitor/platform/alerts-log
> Log alerts do not have dedicated PowerShell or CLI commands currently