Add __all__ to __init__.py

[jwodder]

Because all of the items in the __init__.py namespace are imported from other modules, if a user of dandischema imports or references these items via the top-level dandischema module and they have mypy configured with implicit_reexport = False, then mypy will produce an error. In order to fix this, we need to tell mypy that the items imported into __init__.py are intended for re-export via the __all__ variable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a7f2245) 97.61% compared to head (74334d2) 97.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #195   +/-   ##
=======================================
  Coverage   97.61%   97.61%           
=======================================
  Files          17       17           
  Lines        1758     1759    +1     
=======================================
+ Hits         1716     1717    +1     
  Misses         42       42           

Flag	Coverage Δ
unittests	97.61% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
dandischema/__init__.py	100.00% <100.00%> (ø)

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