Describe the bug
MAS throws ImportError as it is unable to find BlockBlobService in latest azure-storage-blob package

To Reproduce
Steps to reproduce the behavior:

1. From ffmpeg_streaming import MAS
2. Provide the credentials and try to run the python script
3. Script breaks with ImportError

Expected behavior
ImportError shouldn't be thrown and MAS should work as expected

Screenshots
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Local machine (please complete the following information):

• OS: Windows
• FFMped [e.g. 4.1]

Additional context
Add any other context about the problem here.