Data Views: Revisit layout config structure

[ntsekouras]

Currently in view config we have an optional config prop (layout) per layout type (grid, table, etc..).

We're starting to have several kind of displays for fields: primary, media, badge (maybe others in other layouts). It would be good to check if we can consolidate somehow.

We should check whether existing layout config props could be reused in every layout and moved to fields API (example primaryField), we should check whether existing props should be moved to the render function of a field (example badgeFields), and we should explore how/whether to update the visibleFields with a different structure. An example suggestion by @youknowriad is:

Maybe visibleFields could support arrays as fields: [ [ { field: 'preview', display: 'media' }], { field: 'title', display: 'primary' }], { field: 'sync-status', display: 'badge' }, 'anyrandomfield' ]