Is your feature request related to a problem? Please describe.
I am using @azure/arm-servicefabric to list all the service fabric clusters, including the managed clusters, but it only lists Microsoft.ServiceFabric/clusters, and there doesn't seem to be a way to list Microsoft.ServiceFabric/managedclusters

Describe the solution you'd like
I would request you to add the required functionality to achieve this.

Describe alternatives you've considered
None, as I want to stick with azure-sdk-for-js

Additional context
Add any other context or screenshots about the feature request here.