Added 'keyboardEventInit' to test utility

[Blackbaud-SteveBrush]

Allows firing of keyboard events.
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/KeyboardEvent

SkyAppTestUtility.fireDomEvent(autocompleteElement, 'keydown', {
  bubbles: true,
  keyboardEventInit: { key: 'Enter' }
});

FYI: I replaced all instances of TestUtility from SKY UX's spec files with success:
blackbaud/skyux2#1598

[codecov-io]

Codecov Report

Merging #386 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #386   +/-   ##
=======================================
  Coverage   99.25%   99.25%           
=======================================
  Files          71       71           
  Lines        1750     1750           
  Branches      284      284           
=======================================
  Hits         1737     1737           
  Misses         13       13

Flag	Coverage Δ
#builder	100% <ø> (ø)	⬆️
#runtime	94.8% <ø> (ø)	⬆️
#srcapp	100% <ø> (ø)	⬆️

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