Linting blob extension

[hallvictoria]

Applying black & isort linting changes to the blob extension.

[codecov]

Codecov Report

Attention: Patch coverage is 96.36364% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 96.90%. Comparing base (e246bb9) to head (ae6240a).
Report is 5 commits behind head on dev.

Files	Patch %	Lines
azure-functions-extension-blob/tests/__init__.py	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #18      +/-   ##
==========================================
+ Coverage   88.34%   96.90%   +8.55%     
==========================================
  Files           9       12       +3     
  Lines         163      355     +192     
  Branches       11       23      +12     
==========================================
+ Hits          144      344     +200     
+ Misses         17        9       -8     
  Partials        2        2              

Flag	Coverage Δ
unittests	96.90% <96.36%> (+8.55%)	⬆️

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