Grid column cell greys out when there are partially loaded columns

Changes wrt columns

Filter columns

Updated the computed property
filtered columns removed from the grid
removed the isLoaded dependency on the observer which was causing call stack size exceeded issue, applied the partially loaded cell check on number & percent type cells
hide columns with personlization
addJSONData after content is loaded
using hideCol to hide the filtered columns
removed the column hiding from setupColumnVisibilityProperties method which isnt required anymore as it is handled by a separate observer
Fixed failing unit tests
Unit tests for column chooser filtering
Merge pull request #283 from PrimeRevenue/feature/data_column_level_filtering

Grid Column Level Filtering