PIM-2035 : add product groups selector
PIM-2035 : add product groups filter
PIM-2035 : remove default join to groups, will be applied only if the
groups column is displayed or if a filter is applied on groups
PIM-2035 : change the products grid configuration to use new selector
and filter for groups column
PIM-2035 : CS fix
Merge pull request #785 from akeneo/refactor/grid_product_groups

Add groups selector and filter in product grid