Added skyPopoverTrigger attribute to allow mouseenter to show a popover

[Blackbaud-PaulCrowder]

No description provided.

[codecov-io]

Codecov Report

Merging #1172 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1172   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         355     355           
  Lines        6592    6604   +12     
  Branches      844     852    +8     
======================================
+ Hits         6592    6604   +12

Impacted Files	Coverage Δ
src/modules/popover/popover.component.ts	100% <100%> (ø)	⬆️
src/modules/popover/popover.directive.ts	100% <100%> (ø)	⬆️
src/modules/popover/popover-adapter.service.ts	100% <100%> (ø)	⬆️

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