Expose signed_version in generate_container_sas

[janjagusch]

Is your feature request related to a problem? Please describe.

As a user, I want to specify the signed version of my SAS tokens. Currently, this SDK does not expose an obvious way to do this:

generate_container_sas does not expose a signed_version:

azure-sdk-for-python/sdk/storage/azure-storage-blob/azure/storage/blob/_shared_access_signature.py

Lines 429 to 442 in a71376d

	def generate_container_sas(
	account_name: str,
	container_name: str,
	account_key: Optional[str] = None,
	user_delegation_key: Optional[UserDelegationKey] = None,
	permission: Optional[Union["ContainerSasPermissions", str]] = None,
	expiry: Optional[Union["datetime", str]] = None,
	start: Optional[Union["datetime", str]] = None,
	policy_id: Optional[str] = None,
	ip: Optional[str] = None,
	*,
	sts_hook: Optional[Callable[[str], None]] = None,
	**kwargs: Any
	) -> str:

BlobSharedAccessSignature does not expose a signed_version in its constructor. Instead, it always uses ._shared.constants import X_MS_VERSION:

azure-sdk-for-python/sdk/storage/azure-storage-blob/azure/storage/blob/_shared_access_signature.py

Lines 36 to 52 in a71376d

	def __init__(
	self, account_name: str,
	account_key: Optional[str] = None,
	user_delegation_key: Optional[UserDelegationKey] = None
	) -> None:
	'''
	:param str account_name:
	The storage account name used to generate the shared access signatures.
	:param Optional[str] account_key:
	The access key to generate the shares access signatures.
	:param Optional[~azure.storage.blob.models.UserDelegationKey] user_delegation_key:
	Instead of an account key, the user could pass in a user delegation key.
	A user delegation key can be obtained from the service by authenticating with an AAD identity;
	this can be accomplished by calling get_user_delegation_key on any Blob service object.
	'''
	super(BlobSharedAccessSignature, self).__init__(account_name, account_key, x_ms_version=X_MS_VERSION)
	self.user_delegation_key = user_delegation_key

This is my current workaround:

sas = BlobSharedAccessSignature(...)
# Note: You currently cannot set the `x_ms_version` in the `BlobSharedAccessSignature` constructor.
sas.x_ms_version = signed_version
sas_token = sas.generate_container(...)

Describe the solution you'd like

My preferred solution would be:

sas_token = generate_container_sas(signed_version=signed_version, ...)

[github-actions]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @jalauzon-msft @vincenttran-msft.