Add skyplane azure check command

[parasj]

Example usage

$ skyplane azure check testskyplaneazureparas containazure
================================================================================
Checking Skyplane configuration...
================================================================================
✔ Check passed: Azure enabled in config
✔ Check passed: Azure principal ID set in config
✔ Check passed: Azure subscription ID set in config
✔ Check passed: Azure client ID set in config

================================================================================
Checking Azure CLI...
================================================================================
✔ Check passed: Azure CLI installed
✔ Check passed: Azure CLI logged in
✔ Check passed: Azure CLI has subscription set
✔ Check passed: Azure CLI has correct subscription set

================================================================================
Checking Azure UMIs...
================================================================================
✔ Check passed: Azure CLI UMIs listed
✔ Check passed: Skyplane UMI exists
✔ Check passed: Skyplane UMI has correct client ID
✔ Check passed: Skyplane UMI has correct principal ID

================================================================================
Checking Azure Python SDK...
================================================================================
✔ Check passed: Azure Python SDK credential created
✔ Check passed: Azure Python SDK credential is DefaultAzureCredential
✔ Check passed: Azure Python SDK token created

================================================================================
Checking Azure storage management client...
================================================================================
✔ Check passed: Azure Python SDK storage client created
✔ Check passed: Azure Python SDK storage client is StorageManagementClient
✔ Check passed: Azure Python SDK storage accounts listed
✔ Check passed: Skyplane storage account exists

================================================================================
Checking Azure storage account access via UMI...
================================================================================
✔ Check passed: Azure CLI UMI roles listed
✔ Check passed: Skyplane storage account role assigned to UMI
Skyplane storage account roles: ['Contributor', 'Storage Blob Data Contributor', 'Storage Account Contributor']
✔ Check passed: Skyplane storage account has Blob Data Contributor role assigned to UMI
✔ Check passed: Skyplane storage account has Account Contributor role assigned to UMI

================================================================================
Checking Azure container access
================================================================================
✔ Check passed: Azure Python SDK container client created
✔ Check passed: Azure Python SDK container client is ContainerClient
4^C
Aborted!
(base) ~/c/skylark ❯❯❯                                                                                                      ✘ 1
(base) ~/c/skylark ❯❯❯                                                                                                    ✘ 130
(base) ~/c/skylark ❯❯❯ skyplane azure check testskyplaneazureparas containazure                                           ✘ 130
================================================================================
Checking Skyplane configuration...
================================================================================
✔ Check passed: Azure enabled in config
✔ Check passed: Azure principal ID set in config
✔ Check passed: Azure subscription ID set in config
✔ Check passed: Azure client ID set in config

================================================================================
Checking Azure CLI...
================================================================================
✔ Check passed: Azure CLI installed
✔ Check passed: Azure CLI logged in
✔ Check passed: Azure CLI has subscription set
✔ Check passed: Azure CLI has correct subscription set

================================================================================
Checking Azure UMIs...
================================================================================
✔ Check passed: Azure CLI UMIs listed
✔ Check passed: Skyplane UMI exists
✔ Check passed: Skyplane UMI has correct client ID
✔ Check passed: Skyplane UMI has correct principal ID

================================================================================
Checking Azure Python SDK...
================================================================================
✔ Check passed: Azure Python SDK credential created
✔ Check passed: Azure Python SDK credential is DefaultAzureCredential
✔ Check passed: Azure Python SDK token created

================================================================================
Checking Azure storage management client...
================================================================================
✔ Check passed: Azure Python SDK storage client created
✔ Check passed: Azure Python SDK storage client is StorageManagementClient
✔ Check passed: Azure Python SDK storage accounts listed
✔ Check passed: Skyplane storage account exists

================================================================================
Checking Azure storage account access via UMI...
================================================================================
✔ Check passed: Azure CLI UMI roles listed
✔ Check passed: Skyplane storage account role assigned to UMI
Skyplane storage account roles: ['Contributor', 'Storage Blob Data Contributor', 'Storage Account Contributor']
✔ Check passed: Skyplane storage account has Blob Data Contributor role assigned to UMI
✔ Check passed: Skyplane storage account has Account Contributor role assigned to UMI

================================================================================
Checking Azure container access
================================================================================
✔ Check passed: Azure Python SDK container client created
✔ Check passed: Azure Python SDK container client is ContainerClient