Add WriteAccelerator to CachingTypes

[unkaputtbar112]

Is your feature request related to a problem? Please describe.
The CachingTypes are lacking the Write Accelerator in azure.mgmt.compute Model.

class CachingTypes(str, Enum, metaclass=CaseInsensitiveEnumMeta):
    """Specifies the caching requirements. Possible values are: **None,** **ReadOnly,** **ReadWrite.**
    The default values are: **None for Standard storage. ReadOnly for Premium storage**.
    """

    NONE = "None"
    READ_ONLY = "ReadOnly"
    READ_WRITE = "ReadWrite"

Describe the solution you'd like
To have the Write Accelerator added as CachingType, so it can be added/used in Ansible as well when creating/modifying a manageddisk.

Describe alternatives you've considered
None, as it would mean to change the Ansible Module to work directly with CLI commands instead of the Python SDK, which we all know will brick everything as CLI and SDK are not harmonized in regards of dependencies.

Additional context
Even at fetching ManagedDisk Informations, it shows a Disk with WriteAccelerator enabled as "None":
Ansible Output (which is using the azure.mgmt.compute):

Portal View:

I'll also link the issue on Azure.Azcollection Git Repo, just for reference:
ansible-collections/azure#430

[xiangyan99]

Thanks for reaching out.

This library is automatically generated from the swagger in https://github.com/Azure/azure-rest-api-specs.

Please open a swagger issue in that repo.