feat(core): add getFilterArgs() to SlickDataView

[ghiscoding]

as per original SlickGrid PR 1007

It would be very handy for developers to have ability to receive extra arguments of filter function. For example when filter is applyed we can:

• write a custom date editor which can suggest a year for user, relying on the selected year filter;
• fill cell values automatically when adding a new row, otherwise the row will not be displayed;
• and much more.

Previously there was ability to receive extra arguments of filter function by using dataView.filters property and much featers have already been written by using it. Now we need a way to keep these features working.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.8%. Comparing base (5ab671b) to head (f31c3a0).

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1457     +/-   ##
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+ Coverage    99.8%   99.8%   +0.1%     
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  Files         199     199             
  Lines       21691   21693      +2     
  Branches     7124    7261    +137     
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+ Hits        21627   21629      +2     
  Misses         58      58             
  Partials        6       6             

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