fix(azurite): make visible to type checkers

[kveretennicov]

Closes #926 by adding PEP-561 marker file py.typed

[edgarrmondragon]

This is a duplicate of #918

[kveretennicov]

This is a duplicate of #918

#918 has a global remit; this is concerned only with azurite, which, perhaps, will make it easier to land.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.24%. Comparing base (87332c1) to head (44f5e8d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #927   +/-   ##
=======================================
  Coverage   79.24%   79.24%           
=======================================
  Files          15       15           
  Lines        1277     1277           
  Branches      154      154           
=======================================
  Hits         1012     1012           
  Misses        219      219           
  Partials       46       46           

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