Lookup Field Renderer Optimization

[AJIXuMuK]

Q	A
Bug fix?	[ ]
New feature?	[ ]
New sample?	[ ]
Related issues?	no

What's in this Pull Request?

Lookup field rendering using FieldRendererHelper was optimized.
Previously, FieldRendererHelper was sending request to get url of Display form for the list that is referenced in the lookup first and only then rendered the Lookup.
Because of that there was a lag before lookup values are rendered in the cell.
But the Display form url is needed only if a user clicks on the Lookup value. It's not needed to render the values itself.
So, the code was changed to request the url from FieldLookupRenderer itself at the moment when a user clicks on the value.

[codecov-io]

Codecov Report

Merging #50 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #50   +/-   ##
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  Coverage   77.91%   77.91%           
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  Files          10       10           
  Lines         335      335           
  Branches       78       71    -7     
=======================================
  Hits          261      261           
  Misses         55       55           
  Partials       19       19

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[estruyf]

Thanks for the update. Will be included in the next release.