feat(tooltip): add a configurable tooltip delay

[mattlewis92]

Closes #790

[codecov-io]

Codecov Report

Merging #891 into 0.27 will increase coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##            0.27     #891      +/-   ##
=========================================
+ Coverage   98.4%   98.54%   +0.14%     
=========================================
  Files         38       38              
  Lines        813      825      +12     
  Branches      59       60       +1     
=========================================
+ Hits         800      813      +13     
+ Partials      13       12       -1

Impacted Files	Coverage Δ
...r/src/modules/week/calendar-week-view.component.ts	98.52% <100%> (ø)	⬆️
...r/src/modules/common/calendar-tooltip.directive.ts	100% <100%> (ø)	⬆️
...c/modules/day/calendar-day-view-event.component.ts	100% <100%> (ø)	⬆️
...src/modules/month/calendar-month-view.component.ts	96.38% <100%> (+1.26%)	⬆️
...dar/src/modules/day/calendar-day-view.component.ts	99.09% <100%> (ø)	⬆️
...src/modules/month/calendar-month-cell.component.ts	100% <100%> (ø)	⬆️
...modules/week/calendar-week-view-event.component.ts	100% <100%> (ø)	⬆️

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