Added BaseFormSetFactory.form_kwargs and .get_form_kwargs().

[sdolemelipone]

Replacement PR for #257 to address #256.

To add class attribute and method to make overriding form_kwargs more convenient.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.86%. Comparing base (1d14f2a) to head (dd5e88b).
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
+ Coverage   88.77%   88.86%   +0.09%     
==========================================
  Files           6        6              
  Lines         490      494       +4     
  Branches       54       49       -5     
==========================================
+ Hits          435      439       +4     
  Misses         40       40              
  Partials       15       15              

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