(pagination): rewrite simpler pagination service and component

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #382 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #382    +/-   ##
======================================
  Coverage     100%   100%            
======================================
  Files         141    141            
  Lines        8627   8641    +14     
  Branches     2847   2969   +122     
======================================
+ Hits         8627   8641    +14

Impacted Files	Coverage Δ
...lickgrid/components/angular-slickgrid.component.ts	100% <100%> (ø)	⬆️
...s/angular-slickgrid/services/pagination.service.ts	100% <100%> (ø)	⬆️
...s/angular-slickgrid/services/grid-odata.service.ts	100% <100%> (ø)	⬆️
...slickgrid/components/slick-pagination.component.ts	100% <100%> (ø)	⬆️
...ules/angular-slickgrid/services/graphql.service.ts	100% <100%> (ø)	⬆️

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