enhancement: enable grid view for CoreList component #412

[arkaprota]

Enable grid view for CoreList component, so that all children (CoreListItem) appear on grid.

The new variant (GRID) should also support the following:

• [x] props for number of items in every row for different screen sizes (default, sm, md,...)
• [x] props to enable toolbar
• [x] toolbar to navigate between LIST and GRID, preferably multiple GRID sizes (like 3 items per row OR 4 items per row OR ...)
• [x] the toolbar should also have a search (this will only search in the already rendered items)
• [ ] Support lazy loading for the CoreList
• [x] CoreListSubHeader is getting wrapped
• [ ] if a array is sent inside the list it will create a list

[arkaprota]

donot merge it