Add accessibility attributes back into autocomplete popup lines

[ghost]

3 changes:

• Ace.d.ts: Autocomplete not working because of missing type declaration of TextInput.setAriaOptions #5049, Issue #5049 #5057
• Screen reader now conveys the right index information for all the items in the autocomplete menu even though not all are rendered (max. 8).
• Autocomplete pop-up had set as role "listbox" and its items as role "option" according to the accessibility requirements in PR Autocomplete accessibility features #5008 but part of it reverted in PR Fix line height regression #5052. This PR brings the role"option" back only for autocomplete popup ace lines.

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[ghost]

Tests are failing because of a issue in master branch. Waiting for fix to rebase.

[InspiredGuy]

LGTM, but please make sure that tests are not failing in your branch before merging.

[codecov]

Codecov Report

Base: 86.20% // Head: 86.20% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (4b4528d) compared to base (30fc3ea).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5059   +/-   ##
=======================================
  Coverage   86.20%   86.20%           
=======================================
  Files         548      548           
  Lines       41700    41703    +3     
  Branches     6564     6564           
=======================================
+ Hits        35949    35952    +3     
  Misses       5751     5751           

Flag	Coverage Δ
unittests	86.20% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/autocomplete/popup.js	78.76% <100.00%> (+0.28%)	⬆️
src/autocomplete_test.js	97.50% <100.00%> (ø)

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