Add initial research for Flex component (#264)
* Add initial research for Flex component
* Remove FAST's Data Grid alias for Flex
* Add images for Ant Design Space
* Add images for Atlaskit Page
* Add images for Cosmos Stack Layout
* Add images for Bootstrap Flex
* Add images for Evergreen Pane
* Add images for Fluent UI Fabric Stack
* Add images for Primer Flex
* Add images for Fluent UI Stardust Flex
* Remove connection of Grid components with Flex
* Remove W3 Layout Grid
