[Feature Request] Ability to create deployment groups

**Is your feature request related to a problem? Please describe.**
Currently you can only create deployment groups via the UI or the REST API

**Describe the solution you'd like**
az devops deploymentgroups create --organization contoso --project widgets --description foo --name mydeploymentgroup
**Additional context**
There's already a REST API that can be used to create deployment groups
https://learn.microsoft.com/en-us/rest/api/azure/devops/distributedtask/deploymentgroups/add?view=azure-devops-rest-7.2&tabs=HTTP