standardised params for get_queryset_count_before / after

[matthewhegarty]

Extension to #149 which includes the params passed into the parent method.
This is useful if the override of count needs to depend on other params.

Note this will break the interface released in 0.7.2, which means that anyone who has overridded get_queryset_count_before or get_queryset_count_after will have to update their code. We can change the param order or add kwargs to avoid this if required.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (2893b14) to head (7a60e85).

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #150   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            8         8           
  Lines          427       427           
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  Hits           427       427           

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