feat(AcePopup): adding getDataContainer and setVisibleRows methods

[marinsokol5]

Description of changes:

• Extending AcePopup to have a method for setting number of visible rows and a method for fetching the HTML element where data is rendered into. The latter is especially useful for consumers who want to modify the popup themselves, which they often need to if they use the popup within something like https://www.w3.org/WAI/ARIA/apg/patterns/combobox/.

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Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.02%. Comparing base (de21d50) to head (e7a43b6).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5708   +/-   ##
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  Coverage   87.02%   87.02%           
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  Files         598      598           
  Lines       43593    43613   +20     
  Branches     7163     7163           
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+ Hits        37936    37956   +20     
  Misses       5657     5657           

Flag	Coverage Δ
unittests	87.02% <100.00%> (+<0.01%)	⬆️

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[akoreman]

Was there a reason for exposing renderer.$textLayer.element here and not, for example, renderer.content or render.scroller? (which encompass all layers of the popup and might allow more flexibility when styling the popup)