• Package Name: azure-storage-blob
• Package Version: 12.8.1
• Operating System: Ubuntu 20.04
• Python Version: 3.8.10

Describe the bug
If I want to use mypy to statically type check my Python code it fails to find the type information of the azure.storage.blob, despite that there are type comments in the module.

To Reproduce
Steps to reproduce the behavior:

1. pip install azure-storage-blob==12.8.1 mypy==0.910
2. echo "from azure.storage.blob import ContainerClient" > test.py
3. mypy test.py

   test.py:1: error: Skipping analyzing "azure.storage.blob": found module but no type hints or library stubs
   test.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
   Found 1 error in 1 file (checked 1 source file)
   

Expected behavior
I expect mypy to find the type hints in the module.

Additional context

There seem to be type annotations in the code. I asked in the https://gitter.im/python/typing chat and was told that the issue is that there isn't a py.typed file in the package, which seems to be true, since I can't find it in lib/python3.8/site-packages/azure/storage/blob