support downloading from azure blob storage

[jaehwana2z]

Before submitting

• [ x] Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes #242

PR review

Support AzureDownloader in downloader.py

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

Attention: Patch coverage is 82.60870% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@62c2d8f). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             main   #262   +/-   ##
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  Coverage        ?    78%           
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  Files           ?     34           
  Lines           ?   4896           
  Branches        ?      0           
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  Hits            ?   3802           
  Misses          ?   1094           
  Partials        ?      0