feat(filters): add optional filterTypingDebounce for filters w/keyup

[ghiscoding]

• we previously had the filterTypingDebounce but that was only available when using BackendServiceApi (with OData/GraphQL) but this PR goes further and makes it available to any type of grids, so it can now be used with a local grid (JSON dataset)
• we also move the debounce code from the Filter Service into each filter component itself (only the following 2 filters requires this, InputFilter and CompoundInputFilter). The Filter Service shouldn't do any debounce, it should be the responsability of the concerned filter and that is what we refactored in this PR as well.

[codecov]

Codecov Report

Merging #720 (88f3592) into master (cf6593a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #720   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          159       159           
  Lines        10691     10691           
  Branches      3788      3786    -2     
=========================================
  Hits         10691     10691           

Impacted Files	Coverage Δ
...lickgrid/components/angular-slickgrid.component.ts	100.00% <100.00%> (ø)
...s/angular-slickgrid/filters/compoundInputFilter.ts	100.00% <100.00%> (ø)
...p/modules/angular-slickgrid/filters/inputFilter.ts	100.00% <100.00%> (ø)
...dules/angular-slickgrid/filters/inputMaskFilter.ts	100.00% <100.00%> (ø)
...dules/angular-slickgrid/services/filter.service.ts	100.00% <100.00%> (ø)
...modules/angular-slickgrid/services/sort.service.ts	100.00% <100.00%> (ø)

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