BlobImmutabilityPolicyMode
The BlobImmutabilityPolicyMode.
Locked = 2
Blob has a locked immutability policy.
This means the immutability policy cannot be modified or deleted until
it expires.
Mutable = 0
Blob does not have an immutability policy.
Unlocked = 1
Blob has an unlocked immutability policy.
This means the immutability policy can be modified or deleted.